NB/T 11531-2024Determination of total phosphorus, ammonia nitrogen and permanganate index in coal mine water - Flow injection spectrophotometry (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

1 Scope

This document describes the determination of total phosphorus, ammonia nitrogen and permanganate index in coal mine water using flow injection-spectrophotometry.

This document is applicable to the determination of total phosphorus, ammonia nitrogen and permanganate index in coal mine water.

When the detection optical path is 10 mm, the method detection limits and determination limits of total phosphorus, ammonia nitrogen and permanganate index of this method are shown in Table 1.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 6682 Specifications and test methods for water used in analytical laboratories

3 Terms and definitions

There are no terms or definitions that require definition in this document.

4 Working principle of flow injection analyzer

In a closed pipeline, a certain volume of sample is injected into the continuously flowing carrier liquid, and the sample and reagents are reacted in the chemical reaction module according to specific The substances are mixed and reacted in a certain order and proportion, and under the condition of incomplete reaction, they enter the flow detection cell for photometric detection.

5 Determination of total phosphorus