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~f!A2lA Cei1ifica1e No. 1750.02

Refoirenco MmwioI Prcducor

CERTIFICA TE OF ANALYSISComplies with ISO Guide 34, ISO Guide 31,

ISO Guide 35, ISO 17025, ANSI/NCSL Z540-1, and ISO 9001TRACEABLE@ CERTIFIED REFERENCE MATERIAL

This certificate indicates traceability to standard s provided by (NIST) NationalInstitute of Standards and Technology and/or a National 5tandards Laboratory.

Certificate No.: 4065-3022938

Condudivity Standard

4065

9.86 pS/cmDescription:

Catalog Number:

Certificate Date:

Lot: CC8756

July 8, 2010 Expiration Date: July 8, 2011

Certified Value:

Derived Values:

9.86 J,lS/cm U =:1:0.57 J,lS/cm (k=2) at 25°C

9.86 micromho/cm, 101420 ohm-cm, 6.57 PPM D.S.

Certificationmeasurements are performed under ISO Guide 34, A2LAaccreditation no. 1750.02 and are traceable torecognized national and international standards via an unbroken chain of comparisons. Electricalconductance is the reciprocalof electrical impedance. The International System of units (SI), derived unit of conductance, is Siemens (S), also referred toas (mhos) the reciprocal of ohms. The certified value is expressed in microsiemens per centimeter (¡JS/cm).

MEASUREMENT:Ten (10) 100 mi samples were measured from this lot. The conductivity of each sample was derived from ameasurement of the impedance of the solution using a conductivity meter and calibrated cell. The cell and sample weretemperature controlled by submersion in a water bath at 25°C :1:0.015°C.

UNCERTAIN1Y: The certified value is given as the average of the measured samples. The reported uncertainty (uc) isdetermined from the uncertainty of the measurement variation from sample to sample, change due to shelf life, and from theuncertainty of the measurement process. The value of uncertainty is multiplied by k=2, which for a normal distributioncorresponds to a coverage probability of approximately 95%. Uncertainty is calcuiated in accordance with the ISO "Guide tothe Expression of Uncertainty in Measurement" (GUM).

METHOD: The certified reference material is prepared and analyzed by Control Company. The certified reference materialconsists of a mixture of a dllute solution of less than 0.01 % (by mass) potassium chloride (KCL), 25% to 32% (by mass)propanol, and 68% to 75% (by mass) deionized water in equilibrium with atmospherlc carbon dioxide. Mixing was performedby circulation utilizing a proprietary method.

Will<w.~ ~ ~Wallace Berry, Technical Manager Nicol Rodrlguez, Quality Manager

Traceabllity: Standards and Equipment Used

Descrlptlon Traceable Reference

Conductlvlty Standard 19.227 uS CI030

Conductlvlty Probe (4W)/Meter TC23-2724980

Dlgltal Thermometer 4000-3003833

Temperature Callbratlon 8ath TC-191

Laboratory environment conditlons:

Control Company --4455 Rex Road -- Friendswood, TX 77546Tel: (281) 482 1714 Fax: (281) 482 9448 sales@controI3.com www.controI3.com

Control Company Is an ISO Gulde 34:2000 Certlfled Referenee Material (CRM) Produeer Aeeredlted by American Assoelatlon for LaboratoryAeeredltatlon (A2LA Certlfleate No. 1750.02). Certlfleate fulfllls the requlrements of ISO Gulde 31:2000 (Referenee Materials - Contents ofCtl\\W;at~:i o{\d LabeIS), ISO Gulde 34:2000 "Quallty System Guldellnes for the Productlon of Referenee Materials", and ISO Gulde 35:2006"Certlfleatlon of Referenee Materlals - General and Statlstlca\ Prlnclpals'. Control Company 15 an ISO 17025:2005 Callbratlon Laboratory Aeeredltedby American Assoelatlon for Laboratory Aeeredltatlon (A2LA Certlfleate No. 1750.01). Control Company Is ISO 9001:2008 Certlfled by Det NorskeVeritas (DNV Certlfleate No. CERT-01805-2006-AQ-HOU-ANAB). TRACEABLE@ Is a reglstered trademark of Control 3 Ine.

Lot: CC8756 Copyright (e) 2009 Control Companypage 1 of 3

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Serial Number Due Date

2010-3199 11/05/10

634-12-008 8/05/10

22136727 6/29/11

A42238

24.0.C 38%RH 1.01Smb/hPa

~l!A2LA CeI1if~ateNo. 1750.02Reference Material Producer

CERTIFICA TE OF ANALYSISComplies with ISO Guide 34, ISO Guide 31,

ISO Guide 35, ISO 17025, AN51/NC5L Z540-1, and ISO 9001TRACEABLE@CERTIFIED REFERENCE MATERIAL

PACKAGING:This material is available in both a 460 mi bottle and a 100 mi One-Shot™.

INTENDEDUSE: The certified reference material is intended for the calibration of conductivity cell constants, for conductivitymeasurement, for the validation of analytical methods, and for the preparation of working reference standards.INSTRUCTIONSFOR USE: The certified reference material should be open for the minimum time. Rinse the cell in a smallamount of the certified reference material and discard. The recommended sample size for measurement is 100 mI. Discardthe standard after use and under the following circumstances: if the expiration date is past due, four months after opening, orif any color, turbidity, or visible microbiological growth become evident. Standards which have been opened are not protectedfrom growth.

Conductivityis sensitive to temperature, for measurements at a temperature other than 25°C, refer to the temperaturecorrection table provided.

HOMOGENEITY:Ten (10) 100 mi samples were selected for analytical control. Results from different samples showed nostatistically significantdifferences, nor was there any correlation between values obtained and the bottling sequence.Bottle-to-bottle (One-Shot™to One-Shot™) variations of the samples measured are included as a part of the calculatedmeasurement uncertainty stated on page 1 of this certificate. A minimum sample size of 100 mi should be used to maintainthe certified value and the associated statement of uncertainty. This standard as formulated is considered infinitelysoluble.

STABILlTY,SHELFLlFE:The expiration date stated on page 1 indicates the period of time which the certified referencematerial in a properly packaged, unopened, unused, and stored under environmentally controlled and monitored conditionsremains withinthe specified uncertainty range.EXPlRATIONDATE:The date after which a certified reference material should be discarded.

STORAGE:Store below 40°C and above OOC.

SHIPPING: Ship below 50°C and above OOC.

MAINTENANCEOF CERTIFICATION:Control Company monitors representative samples from this lot over the period of itscertification. If a change occurs that affects the certification before the expiration date, Control Company posts amendedcertificates at www.controI3.com\crmupdate.htm.

MSDS INFORMATION: Please refer to the Material Safety Data sheet for information regarding this certified reference materialat www.controI3.com (Search MSDS). Use only the first four digits of the certificate number to locate the MSDS.

QUALlTY STANDARD DOCUMENTATION:

ISO/lEC Guide 34:2000 General Requirements for the Competence of Reference Material Producers,accredited A2LACertificate Number 1750.02. .

ISO Guide 31:2000 Reference Materials - Contents of Certificates and Labels.

ISO Guide 35:2006 Certification of Reference Materials - General and Statistical Principals.

ISO/lEC 17025:2005 General Requirements for the Competence of Testing and Calibration Laboratories,accredited A2LACertificate Number 1750.01.

AN51/NCSLZ540-1: 1994 Calibration Laboratories and Measuring and Test Equipment-General Requirements.

ISO 9001:2008 QualityManagement System Registration -DNVCertificate Number CERT-0180S-2006-AQ-HOU-ANAB

SUPPORTEDMETHODS:This certified reference material meets test requirements for Federal, State, and local agencies, CAP,CLSI, ACS, and CLlA. Traceable@ Certified Reference Material complies with and is essential for use in these official methods:AOAC973.40, EPA 120.1, Standard Method 2510 (APHA,AWWA,WEF), ISO 7888, DIN 38404, ASTM D1125, USGS 1-1780,USP 645, OIMLR56, IUPAC, and for A2LA/NVLAPaccreditations /150 9000 certifications. Material may be used to calibrate allconductivity meters and to determine all conductivity cell constants.

Control Company -- 4455 Rex Road -- Friendswood, TX 77546Tel: (281) 482 1714 Fax: (281) 482 9448 sales@controI3.com www.controI3.com

Control Company Is an ISO Gulde 34:2000 Certlfied Reference Material (CRM) Producer Accredlted by American Assoclatlon for LaboratoryAccredltatlon (A2LA Certificate No. 1750.02). Certlficate fulfills the requlrements of ISO Gulde 31:2000 (Reference Materlals - Contents ofCertificates and Labels), ISO Gulde 34:2000 "Quallty System Guldellnes for the Productlon of Reference Materials", and ISO Gulde 35:2006"Certification of Reference Materlals - General and Statlstlcal Prlnclpals". Control Company Is an ISO 17025:2005 Calibratlon Laboratory Accredltedby American Assoclatlon for Laboratory Accredltatlon (A2LACertlficate No. 1750.01). Control Company Is ISO 9001:2008 Certified by Det NorskeVerltas (DNVCertlficate No. CERT-01805-2006-AQ-HOU-ANAB). TRACEABLE@Is a reglstered trademark of Control 3 Inc. .

page 2 of 3 Lot: CC8756 Copyright (e) 2009 Control Company

~A2LA Certific:ate No. 1750.02

Referenoe Materiaf Producer

CERTIFICA TE OF ANALYSISComplies with ISO Guide 34, ISO Guide 31,

ISO Guide 35, ISO 17025, ANSI/NCSL Z540-1, and ISO 9001TRACEABLE@CERTIFIED REFERENCE MATERIAL

Control Company -- 4455 Rex Road -- Friendswood, TX 77546Tel: (281) 482 1714 Fax: (281) 4829448 sales@controI3.com www.controI3.com

Control Company 15an ISO Gulde 34:2000 Certlfled Referenee Material (CRM) Produeer Aeeredlted by American Assoelatlon for LaboratoryAeeredltatlon (A2LA Certlfleate No. 1750.02). Certlfleate fulfllls the requlrements of ISO Gulde 31:2000 (Referenee Materlals - Contents of

Certlflcates and Labels), ISO Gulde 34:2000 "Quallty 5ystem Guldellnes for the Productlon of Referenee Materlals", and ISO Gulde 35;2006"Certlfleatlon of Reference Materlals - General and 5tatlstleal Prlnelpals". Control Company Is an ISO 17025:2005 Callbratlon Laboratory Accreditedby American Assoelatlon for Laboratory Aeeredltatlon (A2LACertlfleate No. 1750.01). Control Company Is ISO 9001;2008 Certlfled by Det NorskeVerltas (DNVCertlfleate No. CERT-01805-2006-AQ-HOU-ANAB). TRACEABLE@Is a reglstered trademark of Control 3 Ine.

page 3 of 3 Lot: CC8756 Copyright (e) 2009 Control Company

Temperature Correctlon Informatlon 2.870 %

If your eonductlvlty meter allows you to set a temperature eoeffielent (temperature eorrectlon) then the underllned number shown above 15thebest approxlmatlon for thls speelfle analysls for thls speelfle Traeeable@ Certlfled Referenee Material. For more precise measurements use theehart. Use the ehart below only If you are maklng absolute measurements. That 15, measurements wlthout any automatle temperature eorrectlon(temperature eoeffielent set to O). The ehart below dlsplays derlved values.

Uslng a thermometer, measure the temperature of thls eertlfled referenee material. Shown on the ehart 15temperature (In the far left eolumn) inwhole degrees. 5hown aeross the top row 15temperature In tenths of a degree. Loeate the measured temperature In whole numbers on the far lefteOlumn, and then follow aeross the row to the temperature In tenths of a degree. At the intersectlon 15the eertlfled referenee material value at thatspeelfle temperature. 5tandardlze your meter uslng that value. Example: Measured temperature 15 25.0°C. Flnd 25°C In the far left eolumn, flndthe row O.ooC. Where 25°C and O.ooC Intersect, read the value In mleroslemens/em.

Temperature Correctlon Chart In mlcroslemens/cm

O.ooc O.l°C 0.2°C 0.3°C 0.4°C 0.5°C 0.6°C 0.7°C 0.8°C 0.9°C

15°C 7.18 7.20 7.22 7.25 7.27 7.30 7.32 7.35 7.37 7.40

16°C 7.42 7.45 7.47 7.50 7.52 7.55 7.57 7.60 7.62 7.65

17°C 7.67 7.70 7.72 7.75 7.77 7.80 7.83 7.85 7.88 7.90

18°C 7.93 7.95 7.98 8.01 8.03 8.06 8.08 8.11 8.14 8.16

19°C 8.19 8.22 8.24 8.27 8.30 8.32 8.35 8.38 8.40 8.43

20°C 8.46 8.48 8.51 8.54 8.56 8.59 8.62 8.65 8.67 8.70

21°C 8.73 8.75 8.78 8.81 8.84 8.86 8.89 8.92 8.95 8.97

22°C 9.00 9.03 9.06 9.09 9.11 9.14 9.17 9.20 9.23 9.25

23°C 9.28 9.31 9..34 9.37 9.40 9.43 9.45 9.48 9.51 9.54

24°C 9.57 9.60 9.63 9.66 9.68 9.71 9.74 9.77 9.80 9.83

25°C 9.86 9.89 9.92 9.95 9.98 10.01 10.04 10.06 10.09 10.12

26°C 10.15 10.18 10.21 10.24 10.27 10.30 10.33 10.36 10.39 10.42

27°C 10.45 10.48 10.51 10.55 10.58 10.61 10.64 10.67 10.70 10.73

28°C 10.76 10.79 10.82 10.85 10.88 10.91 10.94 10.98 11.01 11.04

29°C 11.07 11.10 11.13 11.16 11.19 11.23 11.26 11.29 11.32 11.35

30°C 11.38 11.42 11.45 11.48 11.51 11.54 11.57 11.61 11.64 11.67

31°C 11.70 11.74 11.77 11.80 11.83 11.86 11.90 11.93 11.96 12.00

32°C 12.03 12.06 12.09 12.13 12.16 12.19 12.22 12.26 12.29 12.32

33°C 12.36 12.39 12.42 12.46 12.49 12.52 12.56 12.59 12.62 12.66

34°C 12.69 12.72 12.76 12.79 12.83 12.86 12.89 12.93 12.96 13.00

35°C 13.03 13.06 13.10 13.13 13.17 13.20 13.24 13.27 13.31 13.34