GB 12596-2008Working chemical - Calcium carbonate (English PDF)

Foreword

The standard Chapter 4, Section 5.3.1,

5.3.2 article are mandatory, other provisions are recommended. This standard replaces GB 12596-1990 "job reference reagent (capacity) of calcium carbonate," major changes compared with the GB 12596-1990 as follows:

--- Standard name to "work reference reagent calcium carbonate";

--- Modify the Content Measurement (1990 version 4.1, this version 5.3);

--- Abolition of the "standard solution formulated Appendix A (Supplement)" (1990 edition Appendix A). The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee Chemistry Chemicals Branch (SAC/TC63/SC3) centralized. This standard is drafted by: Beijing Institute of chemical reagents. The main drafters of this standard. Han Baoying, strong Jing Lin. This standard replaces the standards previously issued as follows:

--- GB 12596-1977, GB 12596-1990. Calcium carbonate work benchmark reagents Molecular formula. CaCO

3 Molecular weight. 100.09 (according to 2005 international relative atomic mass).

1 Scope

GB 12596-2008 is the Chinese national standard on working chemical - calcium carbonate, in the field of chemical technology. It carries no /T suffix, which in the Chinese system means compliance is mandatory: a product or a practice within its scope has to meet it to be lawfully made, sold or carried out in China. It was issued on 18 June 2008 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 June 2009. Classification: ICS 71.040.30, CCS G61. 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 standard specifies the calcium carbonate work benchmark reagents traits, specifications, testing, packaging and inspection rules and signs. This standard applies to titration analysis of calcium carbonate work benchmark test reagent.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. Preparation of

GB/T 601 chemical reagent standard titration solution

GB/T 602 Determination of impurities in chemical reagents prepared standard solution ( GB/T 602-2002,

ISO 6353-1. 1982, NEQ) with

GB/T 603 chemical reagent test method Preparations of articles ( GB/T 603-2002,

ISO 6353-1 with. 1982, NEQ)

GB/T 609 chemical reagent - General method for determination of total nitrogen ( GB/T 609-2006, ISO 6353-1. 1982, NEQ)

GB/T 6682 analytical laboratory use specifications and test methods ( GB/T 6682-2008, ISO 3696. 1987, MOD)

GB/T 9723-2007 Chemicals flame atomic absorption spectrometry General

GB/T 9728 General method for determination of chemical reagents sulfate ( GB/T 9728-2007, ISO 6353-1. 1982, NEQ)

GB/T 9729 General method for determination of chloride Chemicals ( GB/T 9729-2007, ISO 6353-1. 1982, NEQ)

GB/T 9739 General method for determination of iron chemical reagents ( GB/T 9739-2006, ISO 6353-1. 1982, NEQ)

GB 10738 Job reference reagent titration Determination General Weighing

GB 15346 chemical reagent packaging and marking

3 Characters

This reagent is white powder, insoluble in water.

4 Specification

Calcium carbonate as shown in Table 1. Table

5 Loss on drying //% <=

0.2 Table 1 (continued) Name reference work Alkalinity (OH- meter)/mmol/g <=0.0025 Chloride (Cl) //% <=

0.001 Sulphate (SO4) //% <=

0.01 Total nitrogen (N) //% <=

0.01 Magnesium (Mg) //% <=

0.02 Iron (Fe) //% <=

0.001 Heavy Metals (as Pb) //% <=0.001