GB/T 22105.1-2026Soil quality — Determination of total mercury, total arsenic and total lead — Atomic fluorescence spectrometry — Part 1: Determination of total mercury in soil (English PDF)

Foreword

This document is drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document is Part 1 of GB/T 22105, Soil quality - Determination of total mercury, total arsenic and total lead - Atomic fluorescence spectrometry. The following parts of GB/T 22105 have been published:

- Part 1: Determination of total mercury in soil;

- Part 2: Determination of total arsenic in soil;

- Part 3: Determination of total lead in soil.

This document replaces GB/T 22105.1-2008. Compared with GB/T 22105.1-2008, apart from structural adjustments and editorial changes, the main technical changes are as follows:

- the diluent has been deleted (see 3.12 of the 2008 edition);

- multi-position electric heating digestion equipment has been added (see 6.4);

- requirements for samples have been added (see Clause 7);

- the preparation of the test portion has been changed (see 8.1; 5.1 of the 2008 edition);

- the expression of results has been changed (see 9.2; Clause 6 of the 2008 edition);

- quality assurance and control measures have been added (see 10.1 and 10.2; Clause 8 of the 2008 edition);

- precision and trueness have been changed (see 10.3 and 10.4; Clause 7 of the 2008 edition);

- "Test report" has been added (see Clause 11);

- the detection limit has been changed (see Clause 12; Clause 1 of the 2008 edition);

- a quantification limit has been added (see Clause 12).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority shall not be held responsible for identifying any or all such patent rights.

This document was proposed by the Ministry of Agriculture and Rural Affairs of the People's Republic of China and is under the jurisdiction of the National Technical Committee on Soil Quality of Standardization Administration of China (SAC/TC 404).

Drafting organizations: Agro-Environmental Protection Institute of the Ministry of Agriculture and Rural Affairs, Institute of Soil Science of the Chinese Academy of Sciences, Beijing Cultivated Land Construction and Protection Center, Tianjin Geological and Mineral Testing Center.

Main drafters: Dai Lihong, Xu Yaping, Li Junxing, Zhu Xuan, Wang Ruhai, Liu Xiaoxia, Zhang Yan, Jiang Hongxin, Mu Li, Li Li, Lyu Huiying, Dai Zichun, He Zeying, Cai Yanming, Liu Yan.

This document and the document it replaces were issued as follows: first issued in 2008 as GB/T 22105.1-2008; this is the first revision.

Warning

Persons using this document should have practical experience of regular laboratory work. This document does not purport to address all possible safety problems. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions laid down by the relevant national regulations.

1 Scope

This document describes the method for determining total mercury in soil by atomic fluorescence spectrometry.

This document applies to the determination of total mercury in soil.

2 Normative references

The contents of the following documents constitute indispensable provisions of this document through normative references in the text. For dated references, only the edition corresponding to that date applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 6682, Water for analytical laboratory use - Specification and test methods

GB 15346, Chemical reagent - Packaging and marking

HJ 613, Soil - Determination of dry matter and water content - Gravimetric method

NY/T 1121.1, Soil testing - Part 1: Soil sampling, processing and storage

3 Terms and definitions

No terms and definitions are listed in this document.

4 Principle

The soil sample is digested by heating with a nitric acid-hydrochloric acid mixed reagent. Potassium borohydride reduces the mercury in the test solution to atomic mercury, which is carried by the carrier gas (argon) into the atomizer. Irradiated by a mercury hollow cathode lamp, the ground-state mercury atoms are excited to a higher energy state and, on returning to the ground state, emit fluorescence of characteristic wavelength. The fluorescence intensity is proportional to the mercury content of the test solution; the content of the sample is obtained by quantitative calculation against a calibration series.

5 Reagents and materials

Unless otherwise specified, reagents of guaranteed grade or better complying with GB 15346 shall be used in the analysis, and the water used shall comply with grade 2 water of GB/T 6682.

5.1 Hydrochloric acid (HCl): rho = 1.19 g/mL.

5.2 Nitric acid (HNO3): rho = 1.42 g/mL.

5.3 Potassium hydroxide (KOH).

5.4 Potassium borohydride (KBH4).