T/NMRJ 028-2025 Water Quality Determination of Volatile Phenols by Continuous Flow Injection Analysis and Spectrophotometry

Scope

Scope: This document specifies the method for determining volatile phenols in water using continuous flow injection-spectrophotometry. This document is applicable to the determination of volatile phenols in surface water, groundwater, domestic wastewater, and industrial wastewater. When the detection optical path is 50 mm, the method's detection limit is 0.001 mg/L, and the measurement upper limit is 0.200 mg/L. For samples with concentrations exceeding the method's upper limit, they can be measured after appropriate dilution; Main technical content: 1 Scope 2 Normative reference documents 3 Terms and definitions 4 Method principle 4.1 Working principle of continuous flow injection instrument 4.2 Chemical reaction principle 5 Interference and elimination 5.1 Interference of aniline and oil on the determination of volatile phenols in water 5.2 Sulfides can interfere with the determination of volatile phenols 6 Reagents and materials 7 Instrumentation and equipment 8 Samples 8.1 Preparation before sampling 8.2 Sample collection and storage 8.3 Determination of water content 8.4 Preparation of samples 8.5 Preparation of blank samples 9 Analysis steps 9.1 Instrument debugging and calibration 9.2 Calibration 9.2.1 Preparation of standard series 9.2.2 Plotting of calibration curve 9.3 Determination of samples 9.4 Blank experiment 10 Result calculation and presentation 10.1 Result calculation 10.2 Result presentation 11 Precision and accuracy 11.1 Precision 11.2 Accuracy 12 Quality assurance and quality control 12.1 Blank check 12.2 Calibration validity check 12.3 Full-process blank 12.4 Precision control 12.5 Accuracy control 13 Waste disposal

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