Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

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“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 3903 (1984): Dimethoate Emulsifiable Concentrates [FAD1: Pesticides and Pesticides Residue Analysis]

IS : 3903· 1984(Reaffirmed 2004)

Indian StandardSPECIFICATION FOR

DIMETHOATE EMULSIFIABLE CONCENTRATES

(Second Revision)

First Reprint NOVEMBER 2007( Including Amendment Nos. I, 2 & 3 )

UDC 632.951 DIMETHOATE

<0 Copyright 1984

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Gr 3 November 1984

IS I 3903· 191~

Indian StandardSPECIFICATION FOR

DIMETHOATE EMULSIFIABLE CONCENTRATES

( Second Revision)Pest Control Sectional Committee, AFCDC 6

C/u#"". R'/WIs,nlin,DB K. D. PAHABIA Directorate of PlaDt Protection, Quarantine &.

Storage ( Ministry of Agriculture), FaridabadM.."

Da P. K. AOOABWAL IDMA Laboratories, ChandiluhDB S. R.. IYBNOAB ( .4lImuJII)

DB H. L. BAlli Pesticides Residue Analysis Sectional Committeep

AFDC 56, lSIDa B. BAN1I1UD Tea Reaearcb Auociation, Jorhat

DB G. SA'.rYA.ABAY~A (~11""," I )SHBJ S. C. DA8 ( ~lImMI, II )

SIIBI N. S. BmDI1I Shriram Test HOUle, DelhiSBBIR.K.B~mu..(A~)

CmD PLAn PBO'rIioTIOl( Departmenl of Agriculture, Government ofOJ7tOE1\ Maharaabtra, Bombay

ClBBJll8T IlfOJUBQlI, I...CTJ-omB8 TBa'rl1'Q LABoaATOBY ( AI,,,,,,,,,)

DR M. S. DBAT'l' National Malaria Eradi....tion ProlJ"&lDme, DelhiSIIBI V. DOBAIBAJ Pla.tic Containen Sectional Committee, MOpn 11,.

lSISB.! G. D. GOKBALJI Bombay Chemicals Private Limited, Bombay

SHBI V. V. KlrrKAB ( AI,.."." ) .8BBJ N. L. KALa.A National IDltitute of CommUDicable Diseases, Delhi

S.81 G. C. JOlD ( ~l"""".)DB ll. L. KALBA Punjab Agricultural Unlvenity, Ludhia.

Da R. P. CRAWLA ( AlImMu)DB KALYAB 5111GB ChaDder Sekhar Azad University of Ap-iculture

It TedmoIOlY, KanpurDa S. K.. K.IRYD N.ti~naIIDltituteoCOccupational Health (leMR.),.

~d.bad .

National Or••nie Chemical Industries Limited.Bombay

DBS. K. GUft' At. ( .dlUrul, )Shl S. G. Kall....

DB J. S. V.MA ( AlImMt, )SIDI J. K. KHOSLA Metal Container. Sectional Committee, MOlD 12,

lSI .SBBI A. N. BUAftAOBAB'n'A ("'''''11II1')

C> CtIf1riIId 1984BUREAU OF INDIAN STANDARDS

Tbil publicatloD II proceeted under the 1.-. e.,.,ra", ~" (XIV of 1957) aaareprocluetloD lDwbole or iD put by aDy lDeaDI except with writt. perm_ion or tilepublilber ..n be d..... to be aD iDIriDaem-t or copyript aDd. th••id Act.

J

IS I 3903 • 1984

( Conl;nu,d from pag, 1 )

Central Insecricides Cell, Directorate of PlantProtection, Quarantine &. Storage (Ministry ofAgriculture ), Faridabad

RepresentingPaper and Flexible Packaging·Sectional Committee,

MCPD 14, lSIDB J. C. MAJUMDAl\ BASP India Limited, Bombay

DR B. P. CHAlfDIC.ASKXHAR. ( AI'","",)Sanr S. K. MAJUMDAR Central Food Technological Research Institute

( aSIR ), My.ore

M,mIJ,rsDR S. LAKSH)f AN AN

DR S. R. RAftOOAH ( Al",,.tlt, )Dn S. K. MUKERJBB Agricultural Chemicals Division. Indian Agricultural

Research Institute ( lCAR ), New DelhiDB N. K. Roy ( AI',NllJt,)

SUBI K. RAJENDRAN NAIR

SIUU M. Mu'rHU ( Altmaau )Sam K. S. MEHTA Bharat Pulverising Mills Private Limited, Bombay

SHRI S. CHATTBRJEE ( Alt,r1UJla)SRRI L. S. MIRLJt Agromore Limited, Bangalore

SHRI S. K. RA)IAN ( .tll"'Mt, )SHRI J. M. MODI Pesticides Formulators Association of India ( S.S.I. ),

Bombay

DR R. C. GUPTA ( AI,,,,",,, I )SUBt S. K. GHOSH ( Alt"nat, I I )

SRRI P. V. N/\RAYANAN Indian Institute or PackagiDI, BombaySHRt K. B. GUPTA ( Alt6,nat, )

Da V. N. NIGAM Ministry or Defence ( DGI )SaRI M. M. PADALIA Department of Agriculture, Government of Gujarat,

. AhmadabadSHal R. G. JADBJA ( Alt""at, )

SHKI A. R. PANICKED. Hindustan Insecticides Limited, New DelhiDRS. N. DaRIIU.ltH ( AII",..t, ) ..

8111\1 Y. A. P.ADItA. Rallis India Limited, BombaySHRI M. L. SHAH ( "4lt,,nat,.)

DB R. L. RAJ'AK C"...entral Inseetieide Laboratory, Directorate ofPlant Protection, Quarantine at Storace( Ministry or Agriculture ), Faridabad

SIIBI V. C. BHAIlOAVA ( AlurlUJI, I )DJD'UTY DiRECTOR ( PR &. Q.C )

(All"""" II )RBPBBSBlfTATIVB Department of Agriculture, Government of Andhra

Pr&d.h. HyderabadDirectorate General of Technical Development,

New DelhiDR K. D. SRARMA

5Hftl S. C. BAIAI ( Alt"",,,, )DR K. N. SHRIVA8'l'AVA Pesticides Association of India, New Delhi

DB J. C. MA3t1llDAR ( Alt"",II, )Da K. N. SURIVA8'l'AVA Shaw Wallace &. Co Limited, Calcutta

SHar R. N. ROYOROWDBUBY ( Alt"u" )8aRI A. C. SBBor. Excel Industries Limited, Bombay

SHRI P. V. KAlf'OO ( AII.,.""t, )DR K. SrvA8AJfKAaAlf Union Carbide ( India) Limited, New Delhi

DB U. V. 811IGB ( AllmUIl, )

2

18 ••3-1_

( C.rtlu.u,d from /M" 2 )

Director General, lSI (&-~Mm&IJ,,)

&pr,s"alitl,Department of Aaricu1ture. QovernmeDt of Tamil

Nadu. MadrasDR R.. V. VIQIKATABA.'1'NAII aeaiona1 Retearch Laboratory (CSIa ). Hyderabad

DR NAOABJn18a..- RAO ( AI",,,.,, )DB 8 ~NTO'R YBLLO". .f\nalytical Testing Services Pvt Ltd, New Delhi

DR D. B. A x A • T R ANARAYANA ( Altmuat,) .

SHal T. PURNAlfAXDAJI,Director ( Agri It Food )

MnnHr,SSBIN.S.VZNKATARA.AN

S,er,IIJrySHRl LAJIKDJm 81HOH

Deputy Director ( Api It Food ), lSI

11

AMENDMENT NO.1 JULY 1.8TO

IS : 3903 • 1984 SPECIFICATION FORDI"METHOATE EMULSIFIABLE CONCENTRATES

( Second Revision)

( Pal' 4, Cltllll' 2.2.5 ) - Add the Collowins note at the end of tileclause:

'Nan - Tbe material Deed DOt be lubjected to heat treatment if It baa crOllecihal' or itl abelr lir. as ucertaiDed Crom tbe date of maDur.dUM aocI date ofexpiry declared OD tbe coataiD••'

(AFCDC 6)

Printed at Simco Printing Pr.... Dethi

AMENDMENT NO. 2 MAY 1994TO

IS 3903: 1984 SPECIFICATION FOR DIMETHOATEEMULSIFIABLE CONCENTRATES

( Second Revision)

( Page 4, clauseZ.Z.S ) - Delete.

( Page6, clause4.1 ) - Substitute the following for tbe existing:

'When freshly manufactured material ill bulk quantity is offered for inspection,representative samples of the material shall be drawn and tested as prescribed inIS 10627 : 1983 within 90 days of its manufacture. When tbe material is offeredfor inspection after 90 days of its manufacture, sampling sball be done asprescribed in IS 10627 : 1983. However, the criteria for conformity of thematerial when tested, sball be tbe limits of tolerances, as applicable over tbedeclared nominal value and given under clause 1.3.1 of tbe standard.'

( Page 10 clause A-Z.4.1, line 7 ) - Incorporate tbe following after theword 'boiling':

'In order to avoid overheating, a thermostatically controlled beating mental shallbe used.'

(FAD 1)Printed at Simco Printing Pr.... Celt'

AMENDMENT NO. 3 OcrOBER 1"5TO

IS 3903: 1984 SPECIFICATION FOR DIMETHOATEEMULSIFIABLE CONCENTRATES

( SecOll4R.vI.rloIa )

( First coW!r page,pages 1 tlnd3, Foreword tlndScope, tilk) - Substitute'Dimetboate Ee' for 'Dimetboate Emulsifiable Concentrates'.

( Ptlp 4, clause 2.2.3 ) - Substitute 'IS 1448 ( P : 20 ) : 198~' for'IS: 1448 [ P : 20 ] - 1960*'.

(Pille 4,loot-1tOIe with c*' IJUI'*) - Add '(ftm rcvUitlll)' It tbe end.

( Pllge S, clause 3.1 ) - Substitute 'IS: 8190 ( Part 2 ) : 1988t' for 'IS:8190 ( Plrt 2 ) - 1980t'.

( Ptlge5, 100t-IIO" ,,~h ct' IIUI,k ) - Subltitute '( 8«:tJU 1WUitJII)' lor '( lintNtUioft )'.

( Page 6, clause 5.2 ) - Substitute 'IS 1070 : 1992t' for 'IS : 1070 •19nt'.

( P~Be 6, foot-note with 't' mllrk) - Substitute 'Reap.t ..... Wiler ( tItW1WUitJII )' for die existing foot-note.

(FAD 1)Printed at Simco Printing Pr_, Delhi

IS : 3903 • 1984

Indian StandardSPECIFICATION FOR

DIMETHOATE EMULSIFIABLE CONCENTRATES

(Second Revision)

o. FORE WORD

0.1 This Indian Standard (Second Revision) was adopted by theIndian Standards Institution on 31 July 1984, after the draft finalized bythe Pest Control Sectional Committee had been approved by theAgricultural and Food Products Division Council and the ChemicalDivision Council.

0.2 This standard was first published in 1966 and was revised in 1975.In this revision, various requirements of the standard are being up­dated.

0.3 Dimethoate emulsifiable concentrates are largely used in the controlof pests of agricultural and veterinary importance.

0.4 Dimethoate emulsifiable concentrate is generally formulated tocontain 30 percent ( mlm ) of dimethoate.

0.5 In the preparation of this standard due consideration has beengiven to the provisions of the Insect;cid,s Act, 1968 and the Rules framedthereunder. However, this standard is subject to the restrictions imposedunder these, wherever applicable.

0.6 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated,expressing the result of a test or analysis, shall be rounded off in accord­ance with IS : 2·1960·. The number of significant places retained in therounded off value should be the same as that of the specified value in thisstandard.

I. SCOPE

1.1 This standard prescribes the requirements and the methods ofsampling and teat for dimethoate emulsifiable concentrates.

• Rules Cor roundin, off numerical values ( "lJis,d ).

~

18••'-I9M

2. RBQ,UlREMENTS

2.1 Co••tlme.t. - The material shall CODsist of dimethoate,technical, dissolved in suitable 101vent(l), together with emulsifyingagent(s), and with or without Itabilizer(s).

2.1.1 Dlmethoate, technical, employed in the manufacture of thismaterial shall conform to IS : 3902·1975••

2.2 Play.leal - The material shall comply with the physicalrequirements specified in 2.2.1 to 2.2.4.

2.2.1 D,scri/Jtio" - The material shall be a stable homogeneous liquidand shall be free from sediment. Suspended matter shall be negligible.On dilution with water it shall readily form an emulsion, suitable forspray_

NOB - Thoulh iaitially, the product may be homo,eneoUl, a sU,bt separation orresiDoul matter might occur which settles at the bottom, but this does Dot in an)pmanner affect other characteri.tics or the material.

2.2.2 CDld Tes: - No turbidity or separation of solid or oily matter orboth shall occur when the material is subjected to the cold tett at 10°0as prescribed in 13.1 of IS : 6940-1982t or any other lower temperatureas agreed to between the purchaser and the vendor. Introduction of aseeding crystal· is not necessary for the test.

2.2.3 Flillh PDint ( Abll ) - When determined by the method prescribedin IS: 1448 [ P : 10 ]-1960: the ftash point .of the material shall beabove 24-5°0.

2.2.4 Emulsion Stabi'i,! - Any separation, including creaming at thetop and sedimentation at the bottom, .of 100 ml of emulsion prepared instandard hard water with 2 ml of concentrate for agriculture use, shallnot exceed 2 ml when tested by one of the methods prescribed in 13.3of IS : 6940-1982t.

2.2.5 Heal S'd6iliIJ - After treating in accordance with the methodprescribed in 13.4 of IS : 6940-1982t the material shall comply with therequirements of 2.2.1 to 2.2.4 and 2.3.1.

2.3 Claemleal - The material shall comply with the chemicalrequirements Ipecified in 2.3.1 and 2.3.2_

._pecUication for dimethoate, technical (firs' "IIIS;'1I ).tMethod. of t.t tor pesticides and their rormulations (fi,,' mhiM )•*Method. or test tor petroleum and itt products, [P: 20] Flub poiDt by Abel

apparatus.

...

Up to 9

Above 9 and below 5050 and above

II.MS-I9M

2.3.1 Di""tMfl" Cont"" - When determined by the method preecribedin Appendix At the observed dimethoate content, percent ( m/m ) of anyof the samples shall not differ from the declared nominal value by morethan the tolerance limits indicated below:

Nomin.al Value, Percent Tolerance Limit, Percent

+ 10151

± 5 > of the nominal value+ 51

3J2.3.1.1 The actual value of dimethoate content shall be calculated

to the second decimal place and then rounded off to the first decimalplace before applying the tolerances stipulated in 2.3.1.

2.3.1.2 The average content of all the samples taken shall not beless than declared nominal value.

2.3.2 Acidi(1 - When tested by the method prescribed in 11.Sof JS : 6940-1982· t acidity ( as H.S04 ) shall be not more than 1·0 per­cent by mass.

3. PACKING AND MARKING

3.1 PacklDI -- The material shall be packed according to therequirements given in IS : 8190 ( Part 2 )-1980t.

3.2 Marilial - The containers shan be securely closed and shall bearlegibly and indelibly the following information in addition to any otherinformation as is necessary under the Ins,ctitiths Act and Rules:

a) Name of the material;

b) Name of the manufacturer;

c) Date of manufacture;

d) Batch number;

e) Net mu. of contents;

f) Nominal dimethoate content, percent ( m/m ); and

g) The minimum cautionary notice-worded as in the 1"""/;,i4l1 Actand Rules.

-Method. oCe.. Cor ~tlcid. aDd their (ormu).doDS (p"".... ).tRequirelD~tI Corp&ckIDIor pesticides: Part 2 Liquid p..iddea (jr" rlfis;' ).

5

,IS I 3903 • 1984

3.2.1 The product may also be marked with Standard Mark.

3.2.2 The use of the Standard Mark is governed by the provisions of the Bureauof Indian Standards Act. 1986 and the Rules and Regulations made thereunder.The details of conditions under which the licence for the use of Standard Markmay be granted to manufactures or producers may be obtained from the Bureauof Indian Standards.

4. SAMPLING

4.1 Representative samples of the material shall be drawn according tothe method prescribed in IS : 10627-1983*.

5. TESTS

5.1 Tests shall be carried out by the appropriate methods referred toin 2.2.2 to 2.2.5, 2.3.1 and 2.3.2.

5.2 Q,aallty of Realeat. - Unless specified otherwise, pure chemicalsand distilled water ( see IS : l07Q-1977t ) shall be employed in tests.

NOTB - C Pure chemicals' shall mean chemicals that do not contain impuritieswhich affect thea results of analysis.

APPENDIX A( Clause 2.3.1 )

DETERMINATION OF D1METHOATE CONTENT

A.o.GENERALA-O.I For the determination of dimethoate content, two methods havebeen prescribed. The Infra-red Spectrophotometric method shall bereferee method in case of dispute.

A-I. INFRA-RED SPECTROPHOTOMETRIC METHOD

A-I.I PriaelpJ., - The sample is dissolved in carbon disulphide. Theabsorbance of the extract is compared to that of the absorbance of anextract of a standard by infra-red spectrophotometer.

-Method. Cor sampling oCpesticidal rormulations.tSpeclfication for water for gelieral1aboratory use ( s,contl rmsion ).

6

18 I 3903 - 1984

A-l.2 Apparatu8

A-l.2.1 Infra-redSpectrophotometer - Capable of reading in the regionof 9.1 to 11.2 micron, with the slit width, gain and response time andscanning speed adjustment to produce satisfactory signal-to-noise ratioand adequate resolution under the conditions of the test.

A'-1.2.2 Absorption Cells - Sealed cesium iodide absorption cells,having internal light path of about 0·1 rom.

A-l.2.3 H1Podermic Syringe - S-mi and 2-ml capacity.

A-I.3 Realeats

A-I.S.l Dimethoate - Standard of known, plus 99, purity.

A-l.3.2 Carbon Disulphid« - Analytical grade reagent.

A-I.f Procedure

A-I.4.1 Calibration

A-l.4.1.1 Weigh accurately a quantity of standard dimethoate togive a 10 mg per ml solution with carbon disulphide in a suitablevolumetric flask.

A-I.4.l.2 Fill the absorption cell with carbon disulphide. Adjustthe spectrophotometer for the optimum instrument setting with respectto gain, slit width, response, speed and drum drive. Make scan withcarbon disul phide in the cell over the wavelength region 9·1 to 11·2micron.

A-l.4.1.3 'rj1rn the wavelength scale back to its original setting.Fill the cell with solution ( s,e A-I.f.l.l). Make a scan in the wave­length region of 9·1 to 11°2 microns, with the same setting as previouslyused ( se, A-l.4.1.2 ).

A-l.4.l.4 With the base line drawn from go I to 11-2 microns,measure the absorbance of the solution at 9-8 micron.

A-l.4.2 E.rtim'ltion of Actio« Ingrldi,,,t in tAl M.tnisl- Weigh accuratelya quantity of sample to give a 10 mg per ml solution of active ingredientwith carbon disulphide in a suitable volumetric flask_

.4-1.4.2.1 ~Aake a lean of carbon disulphide and the carbondisulphide solution of the material (see A-l.4.2) as prescribedunder A-l.4.1.2 and A-l.4.1.3 using the same cell and setting. Measurethe absorbance as prescribed in A-l.f.l.4.

7

II. SIll· 11M

A-I.I Calcalatl.a

Dimethoate content, percent by mau == -~1 x ;1 x P

where

.A = absorbance of the sample solution ( ", 1.-1.4.2.1 )j

M - mas., in I, of standard dimethoate taken lor the test( I" A-I.4-1.l );

P = purity of standard dimethoate;.AI =:II absorbance of· the standard solution ( SI' A-I.f.l.4 )j andHI = mass, in g, of the sample taken for the test ( SI' A-l.4.2 ).

A-2. ALKALINE HYDROLYSIS METHOD

A-2.1 Priaclple - The procedure is based on the alkaline hydrolysisof dimethoate to form volatile methylamine which is collected anddetermined quantitatively by titrating with standard acid.

A-2.2 Apparat1U - An assembly of the apparatus is illustrated inFig. 1. Minor modifications in the illustrative assembly with regard tojoints might be made. However, it should be ensured that all joints areleak-proo£

A-U a__eal.'

A-2.3.1 PottUnum HJdroNidl Sol"titm - 1'0 N solution in diethyleneglycol.

A-2.S.2 Born Acid Solution - Dlsselve 20 g of boric acid in distilledwater and dilute to 1 litre. Heat at 700e, swirl and cool to room tem­perature. Add 10 ml or O-I·percent bromocresol gr~n indicator andneutralise to a green end point with 0-1 N hydrochloric acid.

A-2.sJJ SlIuUldrd H,droehlorie Acid Solution - 0·1 Nt Itandardized withIOdium carbonate previously dried at 260 to 270°0 for 30 minutes.

A4.4~...--"A-2.4.1 Introduce. into the kettle, a quantity of aample equivalent to

about 0-. I of dimetboate" accurately,w_ghed. Introduce about 4 to, ml of hydrated copper sulphate into the-kettle, by ~e&nl of a a raduat­ed cylinder. ' Add 50 ml or the potaJlium hydroXide .olutiOD to thekettle and add a few ,~. 1»ad. to ensure Imooth eb~_,itJOD. ~pplyailicoae It....·· to the, ~ftt and colllleet the kettle and ccmdeDler UI~I adamp_ . Before ltan '01- boIliD, ensure that the ~tI are leCured~agalDltJeaka,-. Oheck tor leablll 'd~tJnI the experiment with IH paper.

8

11• .,-1114

,..... 'I nuft OD YISREAUXCOLUMN WRAPPED WITHASBESTOS TAPE

300

",,- 35/20 BALL-SOCKET

,,-100 ml t<ETTLE

.. . ~ ELECTRIC HEATING MANTLE,

"'.}~'/ 220 WATTS. RHEOSTAT-CONTROLLED

~""~~All dlmeDlioDi ID millimetr..

Flo. 1 ApPARATUS POll DZTBIlIIIMATIOM OP DIIiETHOATBCONTENT ( ALKALlHB HYDROLYSIS MBTHOD )

9

III 3981'.1184·

Methylamine is alkaline in nature and as such its leakage can be easilydetected with pH paper 7 to 8·5 range. By means of a graduatedcylinder add to the receiver 150 ml of the boric acid solution. Clampthe nitrogen inlet tube securely to the glass inlet tube on the flask andstart the nitrogen flow so as to get slow and uniform bubbling in thereceiver containing boric acid. Apply sufficient heat to the kettle so thatthe contents start boiling. Continue boiling for 90 minutes. Stop heatingwhile continuing to pass nitrogen for next 5 minutes.

NOTE - Heatins of the kettle should be controlled so that proper reftuxiDg iseffected. Carry over of condemate to the receiver, which may result (rom, vigorousdistillation may live hilher result. to the extent of about one percent. So precautionshould always be taken to avoid Iuch carryover. Low heatiDg rate relults in lowresults for dimetboate and further heatiDS than 90 minutes does not help.

,A-2.4.2 Disconnect the receiver first and then nitrogen supply.Transfer the contents of the receiver into a 500-ml Erlenmeyer flask.Rinse the inside and outside of the gas delivery tube and the inside ofthe receiver with boric acid solution adding the washings to theErlenmeyer flask •

.&-2.4.3 Titrate the contents of the Erlenmeyer flask with the standardhydrochloric acid solution to the original green colour of the boric acidsolution. The end point is best determined by comparing the colour tothat of a blank solution of the boric acid and bromocresol green,

A-2.5 CalealatloD

_ '. . 22-93 X V x NDimethoate content, per-cent by mass :._~ - M

where

v == volume, in ml, of standard hydrochloric acid solutionused;

N .. normality of standard hydrochloric acid solution; and·}.II -= mass, in g, of sample taken for test.

1'0

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Printed atSimco Printing Press, Delhi