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GB/T 33584.2-2017 English PDF (GBT33584.2-2017)

GB/T 33584.2-2017 English PDF (GBT33584.2-2017)

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GB/T 33584.2-2017: Seawater quality requirements and analysis methods for seawater cooling system -- Part 2: Determination of zinc

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.
GB/T 33584.2-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 17.060; 13.060
Z 17
Seawater Quality Requirements
and Analysis Methods for Seawater
Cooling System ?€? Part 2. Determination of Zinc
ISSUED ON. MAY 12, 2017
IMPLEMENTED ON. DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Water Quality Requirements ... 4
4 Principle ... 5
5 Reagents and Materials ... 5
6 Apparatus ... 6
7 Analytical Procedures ... 7
8 Result Calculation ... 8
9 Precision ... 8
10 Precautions ... 8
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.
This Part was proposed by State Oceanic Administration.
This Part shall be under the jurisdiction of National Technical Committee for Standardization of Ocean (SAC/TC 283).
Drafting organizations of this Part. State Oceanic Administration Tianjin Institute Sea Water Desalination and Multipurpose Utilization, National Quality Supervision and Inspection Center for Seawater & Brackish Water Utilization Products, and Tianjin Tanggu Zhonghai Anti-Corrosion Technology Development Company.
Chief drafting staffs of this Part. Cheng Guochen, Wu Dongxia, Yin Jianhua, Jiao Chunlian, Liu Yu, Xu Na, and Xu Xu.
Seawater Quality Requirements
and Analysis Methods for Seawater
Cooling System ?€? Part 2. Determination of Zinc
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.
6.3 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 0??g, 5??g, 10??g, 20??g, 30??g, 40??g, 50??g; 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 (??g) 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 (??g) from the standard curve.

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