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है”ह”ह

IS 13854 (1994): Tea - Determination of total ash [FAD 6:Stimulant Foods]

.

-IS 13854 : 1994 IS0 1575 : 1987

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Indian Standard

TEA - DETERMINATION 0-F TOTAL ASH

UDC 663’95 : 543’822

@ BIS 1994

SUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 B4HADUR SHAH ZAFAR MARG

NEW DELHI 110002

February 1994 Price Group 1

.

Stimulant Foods Sectional Committee, FAD 23

NATIONAL FOREWORD

This Indian Standard which is identical with IS0 1575 : 1987 ‘Tea - Determination of total ash’ issued by the International Organization for Standardization ( IS0 ) was adopted by the Bureau of Indian Standards on the recommendation of the Stimulant Foods Sectional Committee ( FAD 23 ), and approval of the Food and Agriculture Division Council.

In the adopted standard certain terminology land conventions are not identical with those used in Indian Standards; attention is drawn specially to the following:

a) Wherever the words ‘International Standard’ appear, referring to this standard, they should be read as ‘Indian Standard; and

b) Comma ( , ) has been used as a decimal marker, while in Indian Standards, the current practice is to use point ( . ) as the decimal marker.

CROSS REFERENCES

In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated:

International Standard Indian Standard . Degree of Correspondence

IS0 1572 : 1980

IS0 1576 : 1988

IS 13852 : 1993 Tea - Preparation of ground sample of known dry matter content

IS 13855 : 1993 Tea - Determination of water- soluble ash and water-insoluble ash

Identical

Identical

IS0 1577 : 1987 IS 13857 : 1993 Tea - Determination of acid- insoluble ash

Identical

In reporting the result of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )‘.

IS 13854 : 1994

IS0 1575 : 1987

Indian Standard

TEA - DETER-MINATION OF TOTAL ASH

1 Scope and Field of Application

This International Standard specifies a method for the determination of the total ash from tea.

2 References

IS0 1572, Tea -- Preparation of ground sample of known dry matter content.

IS0 1576, Tea - Determination of water-soluble ash and water-insoluble ash.

IS0 1577, Tea - Determination of acid-insoluble ash.

3 Definition

For the purposes of this International Standard, the following definition applies.

total ash : The residue obtained after incine- ration at 525 f 25°C under the conditions specified in this International Standard.

4 Principle

Destruction of organic matter by heating at 525 IfI 25°C to constant mass.

5 Apparatus

Usual laboratory apparatus, and the following items:

5.1 Dish, of capacity 50 to 100 ml, made of platinum, porcelain or other material unaffected by the conditions of the test.

NOTE - It is considered that silica dishes are unsuitable for use with this test.

5.2 Furnace, capable of being controlled at 525 f 25°C.

5.3 Steam bath

5.4 Hot-plate

5.5 Desiccator, containing an efficient desiccant.

5.6 Analytical Bmalance.

6 Sample

Use a ground sample of known dry matter content, prepared as specified in IS0 1572.

7 Procedure

7.1 Preparation of the dish

Heat the dish ( 5.1 ) for 1 h in the furnace ( 5.2) at 525 f 25” C. Cool in the desiccator ( 5.5 ). After cooling, weigh to the nearest 0,001 g.

7.2 Test portion

Weigh, to the nearest 0,001 g, about 5 g of the ground sample into the prepared dish ( 7.1 ). ( See IS0 1572. )

7.3 Determination

7.3.3 Heat the test portion in the dish, at a temperature near 100” C until the moisture is expelled. Transfer the dish to+ the furnace ( 5.2 ) and heat at 525 $: 25’ C until the ash is visibly free from carbon particles ( at least 2 h is usually required ). Allow to cool, then moisten the ash with distilled water, dry it on the steam bath ( 5.3 ) and then on the hot- plate ( 5.4 ). Return the dish to the furnace for 60 min, cool in the desiccator and weigh. Heat again in the furnace for 30 min, cool and weigh. Repeat these operations, if necessary, until the difference between two successive weighings does not exceed 0,001 g.

7.3.2 Reserve the total ash for determination of water-soluble ash and water-insoluble ash ( see IS0 1576 ), or of acid-insoluble ash ( see IS0 1577 >, if required.

7.4 Number of determinations

Carry out two separate determinations on the same ground sample ( clause 6 ).

8 Expression or results

8.1 Method of calculation and formula

The total ash yielded by the ground sample, expressed as a percentage by mass on the dry basis, is given by the formula

m x 100 x 100 1 m. RS

where

m. is the mass, in grams, of the test portion;

ml is the m-ass, in grams, of the total ash;

RS is the dry matter content, as a percen- tage by mass, of the ground sample, determined in accordance with IS0 1572.

.

IS 13854 : 1994

IS0 1575 : 1987

Take as the result the arithmetic mean of the two determinations, provided that the require-

9 +est Report

ment for repeatability ( see 8.2 ) is satisfied. The test report shall show the method used and the result obtained. It shall also mention any

8.2 Repeatability operating details not specified in this Inter-

The difference between the results of two national Standard, or regarded as optional, as well as any circumstances that may have

determinations, carried Out SimUltaneouSly Or influenced the result. in rapid succession by the same analyst, shall not exceed 0,2 g of total ash per 100 g of The report shall include all details required for ground sample. complete identification of the sample.

2

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Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of stadardization, marking and quality certification of goods and attending to connected matters in the country.

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Revision of Indian Standards

Amendments are issued to standards as the need arises on the basis of commenrs. Standards are also review-ed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook* and cStandards Monthly Additions’.

This Indian Standard has been developed from Dot : No. FAD 23 ( 334 ).

amendments Issued Since Publication

Amend No. Dat-e of Issue . fext Affected

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