GB/T 33584.2-2017Seawater quality requirements and analysis methods for seawater cooling system—Part 2: Determination of zinc (English PDF)
海水冷却水质要求及分析检测方法 第2部分：锌的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 12, 2017
Implementation date
December 1, 2017
Scope
GB/T 33584.2-2017 is the English-translated version of 海水冷却水质要求及分析检测方法 第2部分：锌的测定.
GB/T 33584.2-2017 is Part 2 of GB/T 33584 and covers the quality required of seawater cooling water together with the spectrophotometric determination of the zinc in it, over the range 0.2 mg/L to 5.0 mg/L. It gives the water quality requirements, the principle, the reagents and materials, the apparatus, the analytical procedure, the calculation of the result, the precision and the precautions.
Zinc is developed with a boric acid - potassium chloride - sodium hydroxide buffer and a zinc reagent ethanol solution, and the absorbance is read at 620 nm in a 1 cm cuvette against a standard curve covering 0 µg to 50 µg of zinc.
The glassware is class A to GB/T 12806, GB/T 12807 and GB/T 12808, with water to GB/T 6682. It was issued on 12 May 2017 and has applied since 1 December 2017.
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Document preview — GB/T 33584.2-2017
National Standard of the People's Republic of China
- ICS
- 17.060; 13.060
- Classification
- Z 17
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Water Quality Requirements4
- 4 Principle5
- 5 Reagents and Materials5
- 6 Apparatus6
- 7 Analytical Procedures7
- 8 Result Calculation8
- 9 Precision8
- 10 Precautions8
Foreword
GB/T 33584 Seawater Quality Requirements and Analysis Methods for Seawater Cooling System can be divided into the following 6 parts.
--- Part 1: Determination of Calcium and Magnesium;
--- Part 2: Determination of Zinc;
--- Part 3: Determination of Chloride;
--- Part 4: Determination of Sulfate;
--- Part 5: Determination of Dissolved Solids;
--- Part 6: Determination of Heterotrophic Bacteria.
This Part belongs to Part 2 of GB/T 33584.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
1 Scope
This Part of GB/T 33584 specifies the seawater cooling water quality requirements and adopting spectrophotometry to determine the zinc in the seawater cooling water.
This Part is applicable to determine the zine content in seawater cooling water at 0.2mg/L ~ 5.0mg/L.
2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 12806 Laboratory Glassware - One-Mark Volumetric Flasks
GB/T 12807 Laboratory Glassware - Graduated Pipettes
GB/T 12808 Laboratory Glassware - One-Mark Pipettes
3 Water Quality Requirements
The major water quality of seawater cooling water shall conform to the provisions of Table 1.
6 Apparatus
6.3 Colorimeter tube with stopper. capacity of 50mL.
6.4 One-mark volumetric flask. capacity of 50mL, 100mL and 1000mL, which shall meet the requirements of Level-A specified in GB/T 12806.
6.5 Graduated pipette. capacity of 1mL, 2mL, 5mL and 10mL, which shall meet the requirements Level-A specified in GB/T 12807.
6.6 One-mark pipette. capacity of 10mL, which shall meet the requirements of Level-A specified in GB/T 12808.
7 Analytical Procedures
7.1 Drawing of standard curve
Use graduated pipette to absorb 0.0mL, 0.5mL, 1.0mL, 2.0mL, 3.0mL, 4.0mL, 5.0mL of zinc standard solution (5.8), place them into 7 pieces of 50mL colorimeter tubes with stopper, respectively; successively add 10mL of artificial seawater (5.9) with the similar salinity as the to-be-tested sample; add water to near the scale line of 25mL.
Successively add, to the above colorimeter tube with stopper, 10.0mL of boric acid - Potassium chloride - sodium hydroxide buffer solution (5.5) and 5.0mL of zinc reagent ethanol solution (5.6); use water to dilute to the scale, shake evenly; the corresponding zinc content is 0µg, 5µg, 10µg, 20µg, 30µg, 40µg, 50µg; stand for 10min. Adjust the spectrophotometer wavelength to be 620nm; use 1cm cuvette, take standard solution with zinc content of zero as the reference solution, to measure the absorbance.
Draw the standard curve with absorbance as the ordinate, zinc content (µg) as abscissa.
7.2 Determination of zinc
Absorb 10mL of specimen by the one-mark pipette, place into 100mL beaker; add 0.5mL of sulfuric acid solution (5.3) and 1mL of ammonium persulfate solution (5.4); add water till the solution volume is 25mL. Slightly boiling for 5min; take off; cool off to the room temperature. Then add 1 drop of methyl orange solution (5.10); use the sodium hydroxide solution (5.1) to turn the solution into yellow.
Transfer the above solution into 50mL colorimeter tube with stopper; add 10.0mL of boric acid - potassium chloride - sodium hydroxide buffer solution (5.5); 5.0mL of zinc reagent ethanol solution (5.6); use water to dilute to the scale, shake evenly. Meanwhile do the blank test of artificial seawater reagent.
Place for 10min; adjust the spectrophotometer wavelength to be 620nm; use 1cm cuvette, take standard solution with zinc content of zero as the reference solution, to measure the absorbance; check out the zinc content (µg) from the standard curve. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 12806-2011 — Laboratory glassware -- One-mark volumetric flasks
GB/T 12807-2021 — Laboratory glassware - Graduated pipettes
GB/T 12808-2015 — Laboratory glassware - One mark pipettes
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