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SN/T 4779.3-2017: Determination of total hardness in bottled water for export. Method by spectrophotometry coupled with flow injection analysis(FIA)
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| SN/T 4779.3-2017 | English | 169 |
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Determination of total hardness in bottled water for export. Method by spectrophotometry coupled with flow injection analysis(FIA)
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SN/T 4779.3-2017
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Basic data | Standard ID | SN/T 4779.3-2017 (SN/T4779.3-2017) | | Description (Translated English) | Determination of total hardness in bottled water for export. Method by spectrophotometry coupled with flow injection analysis(FIA) | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | C53 | | Word Count Estimation | 7,796 | | Date of Issue | 2017-05-12 | | Date of Implementation | 2017-12-01 | | Regulation (derived from) | State-Quality-Inspection-Accreditation (2017) 228 | | Issuing agency(ies) | General Administration of Customs | SN/T 4779.3-2017: Determination of total hardness in bottled water for export. Method by spectrophotometry coupled with flow injection analysis(FIA)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Determination of total hardness in bottled water - Flow injection spectrophotometric method)
People's Republic of China entry and exit inspection and quarantine industry standards
Determination of total hardness in exported bottled water
Flow injection visible spectrophotometry
Released on.2017-05-12
2017-12-01 implementation
People's Republic
The General Administration of Quality Supervision, Inspection and Quarantine issued
Foreword
SN/T 4779 includes the following three parts.
---SN/T 4779.1-2017 Determination of fluorine in exported bottled water by flow injection ion selective electrode method;
---SN/T 4779.2-2017 Determination of chlorine in exported bottled water - Flow injection ion selective electrode method;
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part is proposed and managed by the National Certification and Accreditation Administration.
This section drafted by. Beijing Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China, Beijing Jitian Instrument Co., Ltd., Beijing Food Safety
Full Monitoring and Risk Assessment Center.
The main drafters of this section. Lu Xiaoyu, Liu Ying, Shang Shijin, Liu Laifu, Xiao Jingze, Shou Yi, Zhao Wei, Wang Zhen, Li Long.
Determination of total hardness in exported bottled water
Flow injection visible spectrophotometry
1 Scope
This part of SN/T 4779 specifies a flow injection visible spectrophotometric method for the determination of total hardness in outlet bottled water.
This section applies to the determination of the total hardness of packaged drinking water and natural mineral water.
2 Normative references
The following documents are indispensable for the application of this document. 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
3 method summary
Calcium ions in water are produced by abstracting ethylenediaminetetraacetic acid (EDTA) from disodium magnesium edetate (EDTA-MgNa2)
A more stable calcium EDTA (EDTA-Ca), free magnesium ions react with calcium and magnesium indicators under alkaline conditions to form a purple color
The complex was measured for absorbance at a wavelength of 520 nm and quantified by an external standard method.
4 reagents and materials
Unless otherwise stated, the reagents used were of analytical grade and the water was first-grade water in accordance with GB/T 6682.
4.1 Concentrated ammonia (NH3·H2O). The concentration is 13 mol/L.
4.2 Disodium magnesium edetate (EDTA-MgNa2) (C10H12N2O8Na2Mg·4H2O).
4.3 Ammonium chloride (NH4Cl).
4.4 Calcium and magnesium indicator (C17H14N2O5S).
4.5 Concentrated nitric acid. The concentration is 16 mol/L.
4.6 Ethanol (95%).
4.7 Methyl red indicator (1 g/L). Weigh 0.1 g of methyl red, dissolve in ethanol (95%), and dilute to 100 mL with ethanol (95%).
4.8 Ammonia dilution. 1 mol/L ammonia dilution. Measure 70 mL of concentrated ammonia water (4.1) in a 1000 mL volumetric flask and bring up to volume with water until
Scale.
4.9 Ammonia water conditioning solution. 3mol/L ammonia dilution. Measure 210 mL of concentrated ammonia water (4.1) in a 1000 mL volumetric flask and bring up to volume with water until
Scale.
4.10 EDTA-MgNa2 solution. Weigh 0.2g (accurate to 0.1g) EDTA-MgNa2 (4.2) in a beaker, dissolve, transfer and use water
Capacitance to 1000mL.
4.11 Buffer solution. Accurately weigh 67.6g (accurate to 0.1g) ammonium chloride (4.3) in 572mL ammonia dilution (4.8), dissolve, transfer
And make up to 1000mL with water.
4.12 Calcium and Magnesium Indicator Solution. Accurately weigh 0.25g (accurate to 0.01g) calcium and magnesium indicator (4.4), dissolve in 500mL water, use magnetron
Stir for about 30 min and filter.
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