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GB/T 16632-2008 English PDF (GBT16632-2008)

GB/T 16632-2008 English PDF (GBT16632-2008)

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GB/T 16632-2008: Determination of scale inhibition performance of water treatment agents -- Calcium carbonate precipitation method

This Standard specifies the determination method of scale inhibition performance that similar water treatment agents inhibit the separation of calcium carbonate, i.e., calcium carbonate precipitation method.
GB 16632-2008
GB
ICS 71.040.40
G 76
National Standard
of the PEOPLE Republic of China
Replacing GB 16632-1996
Determination of scale inhibition performance of
water treatment agents - Calcium carbonate
precipitation method
ISSUED ON. APRIL, 2008
IMPLEMENTED ON. SEPTEMBER 1, 2008
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the PEOPLE Republic of China;
Standardization Administration of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Method Summary ... 4
4 Reagents and Materials ... 5
5 Instrument and Apparatus ... 7
6 Preparation of Sample Solution ... 7
7 Analysis Steps ... 7
8 Calculation of Analysis Results ... 8
9 Allowable Difference ... 8
Foreword
This Standard replaces GB/T 16632-1996 ?€?Determination of scale inhibition performance of water treatment agents - Calcium carbonate precipitation method?€?.
Compared with GB/T 16632-1996, there is no technical difference.
This Standard was proposed by China Petroleum and Chemical Industry
Association.
This Standard shall be under the jurisdiction of Water Treatment Agent Branch of National Chemistry Standardization Technical Committee (SAC/TC 63/SC 5). The drafting organizations of this Standard. Qingyuan Jiyuan Industrial Co., Ltd., Tianjin Chemical Research and Design Institute, and Shandong Taihe Water
Treatment Co., Ltd.
Main drafters of this Standard. Wang Zhiqing, Zhu Chuanjun, Sun Baoji, Li Lin, and Bai Ying.
This Standard was issued in 1996 for the first time.
Determination of scale inhibition performance of water
treatment agents - Calcium carbonate precipitation
method
1 Scope
This Standard specifies the determination method of scale inhibition
performance that similar water treatment agents inhibit the separation of calcium carbonate, i.e., calcium carbonate precipitation method.
This Standard is applicable to the assessment of scale inhibition performance that similar water treatment agents inhibit the separation of calcium carbonate. 2 Normative References
The following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 601 Chemical Reagent - Preparations of Standard Volumetric
Solutions
GB/T 603 Chemical Reagent ?€? Preparations of Reagent Solution for Use
in Test (GB/T 603-2002, ISO 6353-1.1982, NEQ)
GB/T 6682 Water for analytical laboratory use - Specification and test
methods (GB/T 6682-1992, neq ISO 3696.1987)
3 Method Summary
Use the prepared water that contains certain amount of calcium bicarbonate and calcium ion AND water treatment agent to prepare the test solution. Under heating conditions, it accelerates the calcium bicarbonate to decompose to calcium carbonate. After equilibrium is reached, determine the calcium ion?€?s per liter (mol/L);
V - the calcium chloride standard solution taken, in milliliter (mL);
M - the molar mass of calcium (Ca2+), in grams per mole (g/mol) (M=40.08). 4.9 Water treatment agent sample solution. 1.00 mL contains about 0.500 mg of water treatment agent (calculated by dry basis).
5 Instrument and Apparatus
5.1 Thermostatic water bath. the temperature shall be controlled at (80??1)??C. 5.2 Conical flask. 500 mL, equipped with stopper of ??5 mm~??10 mm, glass tube of 300 mm long.
6 Preparation of Sample Solution
6.1 Preparation of test solution
Add 250 mL of water into 500 mL flask; use buret to add a certain volume of standard solution of calcium chloride, so as to make the amount of calcium ions to be 120 mg. Use suction pipette to add 5.0 mL of water treatment agent sample solution; shake evenly. Then add 20 mL of borax buffer solution; shake evenly. Use buret to slowly add a certain volume of standard solution of sodium bicarbonate (shake while adding), so as to make the amount of bicarbonate ions to be 366 mg; use water to dilute to scale; shake evenly.
6.2 Preparation of blank test solution
In another 500 mL flask, except that the sample solution is not added with water treatment agent, follow Step 6.1 to operate.
7 Analysis Steps
Respectively place the test solution and the blank test solution in two clean conical flasks; dip these two flasks into thermostatic water bath of (80??1) ??C (the test solution shall not exceed the level of the liquid in the water bath); place in constant temperature for 10 h. After it is cooled to room temperature, use medium speed quantitative filter paper to dry filter. Respectively pipette 25.00 mL of filtrate; place in 250 mL conical flasks; add water to 80 mL; add 5 mL of potassium hydroxide solution and about 0.1 g of calcium - carboxylic acid indicator. Use edetate disodium standard solution to titrate the solution till the end point - it turns from purplish red to bright blue. Use equation (2) to

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