GB/T 1270-2023Chemical reagent—Cobalt(II) chloride hexahydrate (English PDF)

Foreword

This standard gives two levels. analytically-pure and chemically-pure, of which

analytically-pure equivalently uses R 55 "cobalt chloride hexahydrate" in ISO

6353-3.1987 "Reagents for chemical analysis - Part 3.Specifications - Second

series". The differences are as follows.

1 Standard preparation

According to China's national conditions, this Standard adds three chapters.

traits, inspection rules, packaging and marks.

2 Specifications

3 Tests

The determination methods for content, sulfate, ammonium sulfide non-

precipitate in this Standard are basically the same as ISO 6353-3.1987.But

there are differences in determination conditions. Experiments show that there

is no significant difference in the results. Other items refer to the corresponding

standards in a set of general test method standards for chemical reagents that

China has developed. This set of standards is basically formulated using ISO

6353-1.1982 "Reagents for chemical analysis - Part 1.General test methods".

This Standard revised and replaced GB 1270-85 "Chemical reagent - Cobalt

chloride". Compared with GB 1270-85, it deleted the level of guaranteed. In

order to adopt the international standard, corresponding changes have been

made in specifications and test methods in this Standard.

This standard will replace GB 1270-85 from the effective date.

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard was proposed by Ministry of Chemical Industry of the People's

Republic of China.

Chemical reagent - Cobalt (II) chloride hexahydrate

Molecular formula. CoCl2-6H2O

Relative molecular mass. 237.93

1 Scope

This Standard specifies technical requirements, test methods, inspection rules

and packaging as well as marks for chemical reagent - cobalt (II) chloride

hexahydrate.

2 Normative references

The following standards contain provisions which, through reference in this

Standard, constitute provisions of this Standard. At the time of publication, the

editions indicated are valid. All standards are subject to revision. The parties

who are using this Standard shall explore the possibility of using the latest

version of the following standards.

GB/T 601-88, Chemical reagent - Preparations of standard volumetric

solutions

GB/T 602-88, Chemical reagent - Preparations of stock standard solutions

GB/T 603-88, Chemical reagent - Preparations of reagent solutions for use

in test methods

GB/T 619-88, Chemical reagent - Regulations for sampling and acceptance

GB 6682-92, Water for analytical laboratory use - Specification and test

methods (eqv ISO 3696.1987)

GB/T 9723-88, Chemical reagent - General rules for flame atomic absorption

spectrometry

GB/T 9738-88, Chemical reagent - General method for the determination of

water insoluble matter (eqv ISO 6353-1.1982)

GB 15346-94, Chemical Reagent - Packaging and Marking

Where,

X - Mass percentage of cobalt chloride hexahydrate, %;

V - Volume of standard titration solution of disodium ethylenediaminetetraacetic

acid, mL;

c - Concentration of ethylenediaminetetraacetic acid disodium standard titration

solution, mol/L;