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Basic data | Standard ID | GB/T 5750.1-2023 (GB/T5750.1-2023) | | Description (Translated English) | Standard examination methods for drinking water - Part 1: General principles | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | C51 | | Classification of International Standard | 13.060 | | Word Count Estimation | 12,161 | | Date of Issue | 2023-03-17 | | Date of Implementation | 2023-10-01 | | Older Standard (superseded by this standard) | GB/T 5750.1-2006 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 5750.1-2023: Standard examination methods for drinking water - Part 1: General principles---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT5750.1-2023
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 13.060
CCS C 51
Replacing GB/T 5750.1-2006
Standard examination methods for drinking water - Part 1.
General principles
Issued on. MARCH 17, 2023
Implemented on. OCTOBER 1, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 7
4 Selection of inspection methods... 8
5 Report of test results... 8
6 Reagents and concentration indication... 9
7 Experimental water... 10
8 Glassware and washing... 11
9 Operation requirements for testing instruments and equipment... 13
10 Laboratory safety... 13
Foreword
This document is drafted in accordance with the provisions of GB/T 1.1-2020
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
This document is Part 1 of GB/T 5750 Standard examination methods for drinking
water. The following parts of GB/T 5750 have been released.
-- Part 1.General principles;
-- Part 2.Collection and preservation of water samples;
-- Part 3.Water analysis quality control;
-- Part 4.Organoleptic and physical indices;
-- Part 5.Inorganic nonmetallic indices;
-- Part 6.Metal and metalloid indices;
-- Part 7.Aggregate organic indices;
-- Part 8.Organic indices;
-- Part 9.Pesticides indices;
-- Part 10.Disinfection by-products indices;
-- Part 11.Disinfectants indices;
-- Part 12.Microbiological indices;
-- Part 13.Radiological indices.
This document replaces GB/T 5750.1-2006 "Standard examination methods for
drinking water - General principles". Compared with GB/T 5750.1-2006, in addition to
structural adjustments and editorial changes, the main technical changes are as follows.
a) The terms and definitions of "minimum detectable mass", "minimum
detectable mass concentration" and "total minimum detectable mass
concentration" are added (see 3.5, 3.6, and 3.7);
b) The term and definition of "reference solution" are deleted (see 3.5 of the 2006
edition);
c) The report of test results is added (see Chapter 5);
d) The provision that the first method in the standard inspection methods is the
arbitration method is deleted (see 4.1 of the 2006 edition);
e) The requirements for the experimental water are changed (see Chapter 7; see
Chapter 6 of the 2006 edition);
f) The preparation and use of alkaline potassium permanganate cleaning solution
are added (see 8.2.2).
Please note that some content in this document may be subject to patents. The publisher
of this document assumes no responsibility for identifying patents.
This document was proposed by and is under the jurisdiction of the National Health
Commission of the People's Republic of China.
Drafting organizations of this document. National Institute of Environmental Health of
Chinese Center for Disease Control and Prevention, Shanghai Municipal Center for
Disease Control and Prevention, Jiangsu Provincial Center for Disease Control and
Prevention, Jilin Provincial Center for Disease Control and Prevention, Hunan
Provincial Center for Disease Control and Prevention, Zhejiang Provincial Center for
Disease Control and Prevention, Beijing Center for Disease Prevention and Control,
and Henan Center for Disease Control and Prevention.
Main drafters of this document. Shi Xiaoming, Yao Xiaoyuan, Zhang Lan, Chen
Yongyan, Lv Jia, Wang Guoquan, Ji Wenliang, Liu Sijie, Feng Jiali, Han Jianlong, Liu
Liping, and Zhang Rongjie.
The previous versions of this document and the documents it replaces are as follows.
-- First issued as GB/T 5750-1985 in 1985, and first revised as GB/T 5750.1-2006
in 2006;
-- This is the second revision.
1 Scope
This document stipulates the basic principles and requirements for drinking water
quality inspection.
This document applies to drinking water quality inspection, as well as water quality
inspection of source water and drinking water that has been treated, stored, and
transported.
2 Normative references
The following documents contain the provisions which, through normative reference in
this document, constitute the essential provisions of this document. For the dated
referenced documents, only the versions with the indicated dates are applicable to this
document; for the undated referenced documents, only the latest version (including all
the amendments) is applicable to this document.
GB 4789.28 National food safety standard - Food microbiology testing - Quality
Requirements for Media and Reagents
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB 15603 General rules for the hazardous chemicals warehouse storage
GB 19489 Laboratories - General requirements for biosafety
JJG 196 Working Glass Container
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 constant mass
Except for total dissolved solids, the mass difference after two consecutive dryings is
less than 0.2 mg.
3.2 measure
The operation of using a measuring cylinder to take water samples or test solutions.
3.3 pipetting
The operation of taking water samples or testing liquid with plain pipets, graduated
pipettes (also called pipets), or pipettes.
3.4 constant volume
The operation of diluting to the mark with pure water or other solvents in a volumetric
flask.
4 Selection of inspection methods
If there are two or more inspection methods for the same project, the corresponding
inspection method can be selected and used according to the equipment and technical
conditions.
5 Report of test results
5.1 Test results that are lower than the minimum detectable mass concentration of the
method shall be reported as "less than the minimum detectable mass concentration".
5.2 When reporting test results involving indicators required for total quantity limit, if
the test result of each indicator is less than its minimum detectable mass concentration,
report the result as "less than the total minimum detectable mass concentration";
6 Reagents and concentration indication
6.1 The reagents used in this document, if the specifications are not specified, are of
analytical grade (AR). The specifications of indicators and biological dyes are not
specified. If there are special requirements in the inspection method, the provisions in
the inspection method shall prevail.
6.4 In each test method in this document, unless otherwise specified, solvent blank (pure
water or organic solvent) is used as the reference solution.
6.5 Hydrochloric acid, sulfuric acid, ammonia, etc. expressed by density in the
document are concentrated reagents, such as HCl (ρ20=1.19 g/mL), and H2SO4
(ρ20=1.84 g/mL). The concentration of the reagent after preparation is expressed in
moles per liter (mol/L) or volume ratio.
6.6 The preparation methods of reagents are stated in each test method. Table 1 provides
the concentrations of several commonly used acids and alkalis and the formulas for
preparing dilute solutions.
6.7 Concentration of substance B. Also known as the amount of substance B
concentration, it refers to the amount of substance B (nB) divided by the volume (V) of
the mixture; its common unit is mole per liter (mol/L); it is calculated according to the
formula (1).
6.8 The mass concentration of substance B. It refers to the mass (mB) of substance B
divided by the volume (V) of the mixture. Its commonly used units are gram per liter
(g/L), milligram per liter (mg/L), and microgram per milliliter (μg/mL); it is calculated
according to formula (2).
6.11 Volume by volume concentration. It refers to the mixing of two liquids with
volumes V1 and V2, respectively. When the name of the solvent is not indicated, it refers
to mixing with pure water; when more than two specific liquids are mixed with water,
water shall be indicated.
7 Experimental water
7.1 The water used in the inspection is pure water, which can be produced by distillation,
redistillation, sub-boiling distillation, ion exchange, etc., or it can be produced by
composite treatment technology.
7.2 The first-grade water, second-grade water, and third-grade water used for laboratory
testing shall comply with the requirements of GB/T 6682.The water used for
microbiological index testing shall comply with the requirements of GB 4789.28.
7.3 The first-grade water is used for ultra-trace analysis or other analyses with strict
requirements, the second-grade water is used for high-sensitivity microanalysis, and the
third-grade water is used for general chemical analysis.
7.5 Since pure water may be contaminated by CO2, NH3, microorganisms, and other
substances in the laboratory air as well as pollutants from the container wall during
storage, the first-grade water cannot be stored and shall be prepared before use; the
second-grade water and third-grade water can be prepared in appropriate amounts and
stored in corresponding containers that have been pre-cleaned with water of the same
grade.
7.6 Water used at all grades shall not be contaminated during transportation.
8 Glassware and washing
8.1 General requirements for glassware
8.1.1 Inspection and calibration of glassware. Volumetric flasks, burettes, plain pipets,
graduated pipettes, etc. shall be inspected and calibrated in accordance with JJG 196.
8.1.4 When washing glassware, new contamination shall be prevented. For example,
glassware used for measuring iron cannot be washed with a wire handle brush, but can
be washed with a plastic rod tied with foam plastic; glassware used for measuring zinc
and iron cannot be rinsed with tap water after pickling and shall be rinsed directly with
pure water; the vessels used for measuring ammonia and iodide shall be soaked in pure
water after being washed.
8.1.5 If there are special requirements for the washing of vessels in the inspection
method, the provisions in the inspection method shall prevail.
8.2 Preparation and use of washing liquid
8.2.1 A potassium dichromate cleaning solution is prepared and used as follows.
8.2.2 Alkaline potassium permanganate washing solution. Weigh 4 g of potassium
permanganate, dissolve it in a small amount of water, add 10 g of potassium hydroxide,
and dilute to 100 mL with water. It can be used to clean oil stains or other organic
substances. After washing, brown manganese dioxide precipitates in the stained area of
the container, which can be removed with hydrochloric acid (1+1) solution or oxalic
acid lotion, ferrous sulfate, sodium sulfite, and other reducing agents.
8.2.3 Acidic oxalic acid or acidic hydroxylamine washing solution. Weigh 10 g of oxalic
acid or 1 g of hydroxylamine hydrochloride and dissolve it in 100 mL of hydrochloric
acid solution (1+4). It can be used to wash oxidizing substances.
8.2.5 Nitric acid solution. When measuring metal ions, nitric acid solutions of different
concentrations [commonly used (1+9)] can be used to soak and wash glassware.
8.2.6 Liquid soap, alkali liquor and synthetic detergents can be used to wash grease and
organic matter.
9 Operation requirements for testing instruments and equipment
For the balances, analytical instruments, and equipment directly related to the test data
used in each inspection method, the measurement traceability shall be carried out
regularly according to work needs, and detailed records shall be kept to ensure the
normal operation of the instruments and equipment in the analysis work.
10 Laboratory safety
10.1 The basic requirements for the storage of commonly used chemical dangerous
goods shall be implemented in accordance with GB 15603.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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