GB/T 42248-2022Soil and stream sediment—Determination of iodine and bromine content—Decomposition by sintering inductively coupled plasma mass spectrometry (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 a method for the determination of iodine and bromine in soil and water sediments by semi-melting-inductively coupled plasma mass spectrometry.

This document is applicable to the determination of iodine and bromine content in soil and water system sediments with the following determination ranges and method detection limits.

---Method detection limit, iodine is 0.11µg/g, bromine is 0.2µg/g;

---Measurement range, iodine is 0.37µg/g~100µg/g, bromine is 0.66µg/g~100µg/g.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 6041 General rules for mass spectrometry methods

GB/T 6379.2 Accuracy of measurement methods and results (trueness and precision) - Part 2: Determination of repeatability of standard measurement methods Fundamental methods of sex and reproducibility

GB/T 6379.4 Accuracy of measurement methods and results (trueness and precision) Part 4: Determining the correctness of standard measurement methods basic method of degree

GB/T 6682 Analytical laboratory water specifications and test methods

GB/T 14505-2010 General principles and general provisions for chemical analysis methods of rocks and ores

GB/T 14506.1 Methods for Chemical Analysis of Silicate Rocks Part 1: Determination of Adsorbed Water

GB/T 33087 Specifications and test methods of high-purity water for instrumental analysis. Calibration specification for JJF1159 quadrupole inductively coupled plasma mass spectrometer

3 Terms and Definitions

This document does not have terms and definitions that need to be defined.

4 Principles

The sample is melted at high temperature in a muffle furnace by a mixed reagent of sodium carbonate and zinc oxide, and then leached in hot water.

Exchange and separate a large amount of sodium and other cations in the solution, and use an inductively coupled plasma mass spectrometer to measure the sample solution, with iodine isotopes 127I and The bromine element isotope 79Br is qualitative. Within a certain concentration range, the mass spectrometry count value of iodine and bromine elements is proportional to the mass concentration of iodine and bromine elements.

Calculate the content of iodine and bromine in the sample by measuring the mass spectrometer count value of iodine and bromine.