HG/T 3609-2000 Industrial circulating cooling water quality analysis method rules HG/T3609-2000 standard download decompression password: www.bzxz.net

Record number: 7258·2000
HG/T 3609--2000
In the process of industrial circulating cooling water treatment, water quality analysis is an important guarantee for the good effect of water treatment technology, and water quality analysis rules are an important basis for this guarantee.
This standard is proposed after the revision of the French chemical industry standard HG/T3524-1985 "Rules for water quality analysis methods for industrial circulating cooling water". The main differences between this standard and HG/T3524-1985 are: - Added reference standards.
Added requirements for terminology.
Added requirements for standard solutions.
Added requirements for method precision.
From the date of implementation of this standard, HG/T3524-1985 will be abolished. This standard was proposed by the Technical Supervision Department of the former Ministry of Chemical Industry of the People's Republic of China. This standard was issued by the Water Treatment Agent Branch of the National Chemical Standardization Technical Committee. The drafting unit of this standard: Tianjin Chemical Research and Design Institute. The main drafters of this standard are Zhu Chuanjun, Lan Chengjun, Shao Hongqian and Li Lin. This standard was first issued in 1985 as the standard issued by the Ministry of Chemical Industry HG/T5-1592--1985. It was converted into the chemical industry standard in 1999 and renumbered. After revision in 2000, it was changed to this number. 655
1 Scope
Chemical Industry Standard of the People's Republic of China
Principle for water quality analytical methodsof industrial circuiating cooling water This standard specifies the general requirements and rules for water quality analytical methodsof industrial circuiating cooling water. This standard is applicable to the water quality analysis of industrial circuiating cooling water. 2 Referenced standards
HG/T 3609---2000
Replaces HG/T3524-1985
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T601-1988 Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents GB/T602-1988 Preparation of standard solutions for determination of impurities in chemical reagents (neaISO6353-11982) GB/T603-1988 Preparation of preparations and products used in test methods for chemical reagents (negISO6353-1:1982) GB3100-1993 International System of Units and Its Application (eqvISO1000:1993) GB3101-1993 General Principles of Quantities, Units and Symbols (eqvISO31-0:1993) GB/T6379-1986 Precision of test methods Repeatability and reproducibility of standard test methods determined by inter-laboratory tests (neq ISO 5725: 1981)
GB/T6682-1992 Specifications and test methods for water used in analytical laboratories (neqISO3696:1987)GB/T14666-1993 Terminology of analytical chemistry
3 Requirements
3.1 Terminology
The terms used in the method shall comply with the provisions of GB/T14666. 3.2 Units and symbolsbzxZ.net
The units and symbols used in the method shall comply with the provisions of GB3100 and GB3101. 3.3 Principles and chemical reactions of the method
The basic principle of the method should be briefly described, and the chemical reaction formula should be written as much as possible when necessary. 4 Meaning of some terms in the method
4.1 Temperature
The temperatures referred to in the method are all expressed in Celsius, with C attached after the Arabic numerals. Room temperature refers to (23 ± 2)°C; normal temperature refers to 15 Cm25°C
4.2*Heating in a water bath*
Unless otherwise specified, refers to heating in a boiling water bath. 4.3*Incineration (or drying) to constant weight"
Approved by the State Administration of Petroleum and Chemical Industry on May 23, 2000656
Implementation on December 1, 2000
HG/T3609—2000
Unless otherwise specified, refers to incineration (or drying), cooling to room temperature in a desiccator and weighing. Repeat until the difference between two consecutive weighings is no more than 0.0002g, which is constant weight. Take the most The latter mass is used as the basis for calculation. 4.4 "Accurate weighing", "accurate measurement" and approximate weighing and measuring quantity "Accurate weighing" means weighing to 0.0002g, and "accurate measurement" means measuring volume to 0.02ml. When only a numerical value is written in the method, it means weighing or measuring to the last digit of this value. For example, weigh 0.4124g of sodium chloride. When the quantity expressed in the method is marked with "approximately", it means an approximate value or a quantity measured with a simple measuring instrument. 5. Reagents and Materials
5.1 The reagents and water used in the method, unless otherwise specified, refer to analytically pure reagents and grade 3 water specified in GB/T6682. 5.2 The standard solutions, impurity standard solutions, preparations and products required in the method, unless otherwise specified, shall be prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603. 5.3 The standard solutions for titration analysis (volume analysis) shall generally not be stored for more than two months at room temperature (15°C to 25°C). 5.4 The concentration of the standard titration solution is expressed in mol/L\, and the basic unit shall be indicated. 5.5 When the solution is not indicated with which solvent it is prepared, it refers to an aqueous solution. The concentration of a reagent prepared with a liquid solute is expressed as the volume of the solute plus the volume of the solvent. For example: a hydrochloric acid solution of 1 plus 3 refers to a mixture of 1 volume of hydrochloric acid and 3 volumes of water. 5.6 The concentration of a reagent prepared with a solid solute is expressed in "g/L". 5.7 The acid or ammonia used in the method is concentrated acid or ammonia if the concentration is not specified. 6 Sample filtration
Except for those specifically specified, general filtration should use fast, medium or slow qualitative filter paper according to needs. 7 Instrument calibration
Glass measuring instruments, balances, acidity meters, spectrophotometers, conductivity meters, etc. used in analysis should be calibrated regularly. 8 Selection of analytical methods
If there are several analytical methods for the same measurement item, you can choose the best one according to different conditions. 9 "Blank in the method" refers to a blank test that does not contain the substance to be tested and is carried out simultaneously with the sample analysis, and is completely consistent with the method and reagent volume used in the sample analysis. 10 Test results 10.1 Expression of results The method of expressing the results, calculation formula and simplified formula, the meaning and unit of symbols, numbers and factors in the formula, and the number of significant digits should be stated. 10.2 Precision Precision should be determined in accordance with the relevant provisions of GB/T6379. Precision is expressed in repeatability and reproducibility. Repeatability refers to the results obtained by the same operator, in the same laboratory, using the same analytical method, on the same sample under normal and correct analytical operations. Reproducibility refers to the consistency of the results obtained by different operators in different laboratories using the same analytical method to analyze the same sample multiple times under normal and correct analytical operations. The repeatability and reproducibility values ​​of the method are the allowable fluctuations of the measured values, which can be expressed as the difference between the maximum and minimum allowable values. They depend on the specific method and the specific conditions of the object being measured, and are generally expressed in absolute values. 657
10.3 Accuracy
HG/T3609-2000
The accuracy of the method is the degree of closeness of each test result to the recognized standard value. It can be expressed as the difference between the maximum allowable value and the standard value and the difference between the minimum allowable value and the standard value. 658
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