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GB/T 5750.1-2006 English PDF (GBT5750.1-2006)

GB/T 5750.1-2006 English PDF (GBT5750.1-2006)

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GB/T 5750.1-2006: Standard examination methods for drinking water -- General principles

This Part specifies the basic principles and requirements for water quality test of drinking water. This Part applies to the water quality test of drinking water, and also applies to the water quality test of source water and drinking water which has been processed, stored and transported.
GB/T 5750.1-2006
ICS 13.060
C 51
Partly replacing GB/T 5750-1985
Standard examination methods for drinking water -
General principles
Issued by. Ministry of Health of the PEOPLE Republic of China;
Standardization Administration of the People's Republic of
Table of Contents
Foreword ... 3
1 Scope .. 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Selection of test methods ... 6
5 Reagents and concentration expressions ... 6
6 Test pure water .. 8
7 Glassware apparatus and washing ... 9
8 Metrological verification and maintenance of testing instruments and
equipment .. 10
9 Laboratory Safety .. 10
GB/T 5750, Standard examination methods for drinking water, comprises the following parts.
-- General principles;
-- Collection and preservation of water samples;
-- Water analysis quality control;
-- Organoleptic and physical parameters;
-- Nonmetal parameters;
-- Metal parameters;
-- Aggregate organic parameters;
-- Organic parameters;
-- Pesticides parameters;
-- Disinfection by-products parameters;
-- Disinfectants parameter;
-- Microbiological parameters;
-- Radiological parameters.
This Part replaces the general rules in the general principles of the first part of GB 5750-1985.
Compared with GB 5750-1985, the major changes of this Standard are as follows. -- the structure is adjusted in accordance with GB/T 1.1-2000, Directives for standardization - Part 1. Rules for the structure and drafting of standards, and GB/T 20001.4, Rules for drafting standards - Part 4. Methods of chemical analysis; -- the quantities and measurement units are modified in accordance with the requirements of national standards;
-- the equivalent concentration is changed into the molar concentration (the equivalent concentration is reserved in the redox part);
-- the mass concentration expression symbol is changed from C to ?? and the content expression symbol from M to m;
-- the content of test pure water, testing instruments , metrological verification and Standard examination methods for drinking water -
General principles
1 Scope
This Part specifies the basic principles and requirements for water quality test of drinking water.
This Part applies to the water quality test of drinking water, and also applies to the water quality test of source water and drinking water which has been processed, stored and transported.
2 Normative References
The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB 5749, Standards for drinking water quality
GB/T 6682, Water for analytical laboratory use - Specification and test methods (GB/T 6682-1992, NEQ ISO 3696.1987)
GB 15603, Rule for storage of chemical dangers
GB 19489, Laboratories - General requirements for biosafety
JJG 196, Verification regulation of working glass container
3 Terms and Definitions
For the purposes of this Standard, the following terms and definitions apply. 3.1
constant weight
Refer to the difference between the masses after two consecutive dryings is below 0.2 mg, in addition to dissolved total solids.
sensitivity microanalysis. Grade III water is used for general chemical analysis. 6.4 Water of all grades shall be packaged using special, closed containers which are made of polyethylene, polypropylene, polycarbonate etc. Grade III water may also be packaged using special glass containers. New containers shall be processed before use; they are usually soaked in 20% hydrochloric acid solution for 2 d ~ 3 d; then they are washed repeatedly using water to be tested; and they shall be filled with water to be tested for soaking for more than 6 h and used after being drained off. 6.5 Grade I water may be contaminated by CO2, NH3 and microorganisms in the laboratory air, or other matters or pollutants from the wall of containers. Therefore, grade I water shall be prepared immediately before use; and the period of storage for grade II water and grade III water shall be preferably short.
6.6 Water of all grades shall be prevented from contamination during the transportation process.
7 Glassware apparatus and washing
7.1 Verification and calibration of glassware apparatus. volumetric flasks, burettes, ungraduated pipettes, graduated pipettes etc. shall be verified and calibrated in accordance with JJG 196.
7.2 When a standard color series is prepared. a set of colorimetric tubes is needed; the inner diameters and scale division of all tubes should be consistent; and the volume shall be calibrated if necessary.
7.3 Glassware shall be washed completely before use. Glassware may be washed using tap water for soaking and rinsing, then using detergent for soaking and washing, using tap water for rinsing thoroughly and finally using pure water for leaching for three times. After washing, the inner walls of glassware shall be moistened uniformly by water. If there are spots with small water drops or hydrophobic places, it indicates that oil dirt exists on the wall of containers; and therefore, they shall be washed once again. 7.4 Preparation and use of detergent
7.4.1 Detergent is prepared using potassium dichromate solution and concentrated sulfuric acid. Weigh 100 g of industrial, finely powdered potassium dichromate to put into a beaker; add about 100 ml of water; add industrial sulfuric acid slowly along the wall of the beaker; and use a glass rod to stir while adding (caution. an exothermic reaction, so spill of sulfuric acid shall be prevented). There are red chromic acid precipitations when starting to add sulfuric acid. Add sulfuric acid until the precipitations happen to be dissolved.
7.4.2 Detergent is a strong oxidizing agent, but it works slowly. Therefore, the containers to be washed shall be in full contact with detergent, soaking for several minutes to several hours. In the use of the containers washed using detergent,

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