GB/T 13025.8-2012General test method in salt industry - Determination of sulfate (English PDF)

Foreword

This Standard belongs to a complete group of general test methods in salt industry; the complete group comprises the following 13 parts at present; and other test method standards will be developed in the future, if necessary. -- GB/T 13025.1 General Test Method in Salt Industry - Determination of Grain Size -- GB/T 13025.2 General Test Method in Salt Industry - Determination of Whiteness -- GB/T 13025.3 General Test Method in Salt Industry - Determination of Moisture -- GB/T 13025.4 General Test Method in Salt Industry - Determination of Insoluble Matter -- GB/T 13025.5 General Test Method in Salt Industry - Determination of Chloride Ion -- GB/T 13025.6 General Test Method in Salt Industry - Determination of Calcium And Magnesium -- GB/T 13025.7 General Test Method in Salt Industry - Determination of Iodine -- GB/T 13025.8 General Test Method in Salt Industry - Determination of Sulfate -- GB/T 13025.9 General Test Method in Salt Industry - Determination of Lead -- GB/T 13025.10 General Test Method in Salt Industry - Determination of Ferrocyanide -- GB/T 13025.11 General Test Method in Salt Industry - Determination of Fluoride -- GB/T 13025.12 General Test Method in Salt Industry - Determination of Barium -- GB/T 13025.13 General Test Method in Salt Industry - Determination of Arsenic This Standard is the 8th part of GB/T 13025. This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 13025.8-1991, General Test Method in Salt Industry - Determination of Sulfate Ion. Compared with GB/T 13025.8-1991, the main technical differences of this Standard, except editorial modifications, are as follows: -- it cancels the photometric analysis method. This Standard was proposed by China National Light Industry Council and shall be under the jurisdiction of the National Standardization Technical Committee of the Salt Industry. The drafting organizations of this Standard. National Standardization Center of Sea- lake Salt and Henan Province Supervision and Testing Station of Salt Products. The drafters of this Standard. Tong Yunkun, Xu Suling, Yu Xiuling and Yuan Huijie. The previous edition replaced by this Standards is as follows: -- GB/T 13025.8-1991. General Test Method in Salt Industry - Determination of Sulfate

1 Scope

GB/T 13025.8-2012 is the Chinese national standard on general test method in salt industry - determination of sulfate, in the field of chemical technology. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 29 June 2012 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 December 2012. Classification: ICS 71.060.50, CCS X35. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Part of GB/T 13025 specifies the method for determination of sulfate in salt products and salt chemical products. This Standard applies to the determination of sulfate in salt products and salt chemical products as well as their raw materials.

2 Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced document (including any amendments) applies to this Standard.

GB/T 6682-2008 Water for Analytical Laboratory Use - Specification and Test Methods

3 Gravimetric Method

3.1 Principle Adjust the sample solution to acidity; add barium chloride solution to form barium sulfate precipitation; filter, wash, dry and weigh the precipitate; and calculate the content of sulfate.

4 Volumetric Method (EDTA Complex Titration Method)

4.1 Principle Barium and sulfate in the sample produces indissolvable barium sulfate precipitate; use ethylene diamine tetraacetic acid disodium (EDTA) standard solution for titration for the surplus barium ion; determine sulfate indirectly.