GB/T 34550.2-2017Method for evaluation of cooling seawater treatment agents - Part 2: Determination of scale inhibition performance (English PDF)
海水冷却水处理药剂性能评价方法 第2部分：阻垢性能的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
September 29, 2017
Implementation date
January 1, 2018
Scope
GB/T 34550.2-2017 is the English-translated version of 海水冷却水处理药剂性能评价方法 第2部分：阻垢性能的测定.
GB/T 34550.2-2017 is the Chinese standard "Method for evaluation of cooling seawater treatment agents - Part 2: Determination of scale inhibition performance".
Its scope clause reads: GB/T 34550 provisions of this part of the water treatment chemicals to inhibit the precipitation of calcium carbonate scale cooling seawater scale inhibition performance measurement method.
This section applies to water treatment chemicals to inhibit the precipitation of calcium carbonate scale cooling scale determination of performance and evaluation. Its clauses include principle; reagents and materials.
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Document preview — GB/T 34550.2-2017
National Standard of the People's Republic of China
- ICS
- 07.060
- Classification
- A 29
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 principle
- 4 Reagents and materials
1 Scope
GB/T 34550 provisions of this part of the water treatment chemicals to inhibit the precipitation of calcium carbonate scale cooling seawater scale inhibition performance measurement method.
This section applies to water treatment chemicals to inhibit the precipitation of calcium carbonate scale cooling scale determination of performance and evaluation.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682 analytical laboratory water specifications and test methods
GB/T 12804 laboratory glass measuring cylinder
GB/T 12805 Laboratory glassware burette
GB/T 12806 laboratory glassware single standard line capacity bottle
GB/T 12808 laboratory glassware single standard pipette
GB/T 15724 laboratory glassware beakers
3 principle
Using sea water as test water, adding water treatment agent to prepare a sample. The sample heated under conditions to promote accelerated decomposition of calcium bicarbonate
Calcium carbonate. To a certain concentration ratio, after the balance, the determination of calcium ion concentration and alkalinity in the sample, calculate the calcium ion scale inhibition rate (eta) and chloride
Difference between concentration and alkalinity concentration (deltaA). For both phosphate (PO43-) and zinc ions (Zn2) deposition of calcium carbonate
The impact of the addition of a certain amount of PO43- and Zn2 comprehensive assessment.
4 Reagents and materials
Except as otherwise specified, only analytical grade reagents and grade 3 water as defined in GB/T 6682 are used in the method.
4.1
seawater, taken from the seawater cooling project site.
4.2
water treatment agent stock solution .1.00 mL contains 2mg water treatment agent (dry basis).
4.3
pH standard buffer solution pH values at 25 ° C were 4.00, 6.86 and 9.18, respectively.
4.4
Triethanolamine solution (1 2).
4.5 Potassium hydroxide solution (200 g/L)
Store in polyethylene bottle.
4.6
Phosphate stock solution [c (PO43 -) = 2.5 mg/mL] 3.583 g of dihydrogen phosphate previously dried in an oven at 105 ° C
Potassium, dissolved in 300mL water, diluted to volume 1000mL, stored in polyethylene bottles.
4.7
Zinc salt stock solution [c (Zn2) = 2.5mg/mL] Weigh 11g zinc sulfate heptahydrate, dissolved in 300mL water, dilute to volume to
1000mL, stored in a glass reagent bottle.
4.8
silver nitrate standard solution [c (AgNO3) = 0.1mol/L].
4.9
Disodium edetate standard solution [c (EDTA) = 0.01mol/L].
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 34550.3-2017 — Method for evaluation of cooling seawater treatment agents - Part 3: Determination of inhibiting microbes performance
GB/T 34550.1-2017 — Method for evaluation of cooling seawater treatment agents—Part 1: Determination of corrosion inhibition performance
GB/T 34550.4-2017 — Method for evaluation of cooling seawater treatment agents—Part 4: Dynamic simulation test
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GB/T 34550.2-2017
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