Total nitrogen detection

This standard specifies the terms and definitions for the detection of chemical characteristics of household waste, the collection and preparation of samples, the detection methods and quality control and assurance of 16 items, including chlorine, organic matter, total chromium, mercury, pH value, cadmium, lead, arsenic, total nitrogen, total phosphorus, total potassium, carbon, hydrogen, nitrogen, sulfur, oxygen, etc. This standard is applicable to the determination of the chemical characteristics of household waste. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 601 Preparation of Standard Titration Solutions for Chemical Reagents GB/T 6682 Specification and Test Methods for Analytical Laboratory Water GB/T 8170 Rules for Rounding off Values and Representation and Determination of Limit Values CJ/T 313 Methods for Sampling and Analysis of Household Garbage 3 Terms and Definitions The following terms and definitions apply to this document. 3.1 Chemical characteristics The properties exhibited by a substance in chemical changes, such as acidity, alkalinity, stability, oxidation, reduction, etc. 3.2 Limit of Detection The minimum concentration or amount of substance to be tested that a specific analytical method can detect from a sample within a given confidence level. 3.3 Accuracy The degree of conformity between the measured value and the true value. Analysis and evaluation can be conducted by directly measuring the standard sample or measuring the recovery rate of the standard sample. 3.4 Precision The degree of consistency between the results obtained by performing the test steps multiple times under certain conditions. The smaller the random error that affects the experimental results, the higher the precision of the experimental results

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