BIS Seeks Public Comments on Revised Ammonium Bromide Standards
The Bureau of Indian Standards is seeking comments until 26 June on the second revision of the standard for Ammonium Bromide, Pure and Analytical Reagents (IS 2723). This compound is widely used in the production of silver bromide in the chemical industry, in medicine and as an analytical reagent.
Historical Background
This standard was first issued in 1964 and later amended in 1985. In the first revision, a more sensitive reference method for the determination of iron was added, reducing the amount of reagents required. The method for the determination of heavy metals was also updated, and a new requirement for analytical reagent grade arsenic was established.
Scope of Application
This standard specifies the requirements and techniques for the collection and testing of ammonium bromide, pure and analytical reagent.
Key Provisions of the Amendment
Instrumental methods for the determination of iron, lead, arsenic, sulphates, and chlorides have been added as alternative test procedures in this revision. Furthermore, editorial corrections have been made where necessary. The Reference clause has also been added. Additionally, the clause on packaging and marking has been revised.
Grades and Properties
Ammonium bromide is divided into two grades: pure and analytical reagent. The maximum permissible limits for the two grades are as follows:
| Pure grade | Analytical grade | |
| Chlorides | 0.6% by mass | 0.2% by mass |
| Bromates | 0.001% by mass | 0.001% by mass |
| Heavy metals (e.g. Lead) | 0.001% by mass | 0.0005% by mass |
| Iron | 0.008% by mass | 0.0002% by mass |
| Sulphates | 0.06% by mass | 0.01% by mass |
| Sulphate ash | 0.1% by mass | 0.001% by mass |
| Arsenic | 10ppm | 1ppm |
The material shall be in the form of small colourless crystals or white crystalline powder, free from foreign bodies and visible impurities. It is slightly hygroscopic and slowly turns yellow in air and should be stored in tightly closed containers.
Packaging and Labelling
The product must be packaged in clear galvanized iron drums lined with polyethylene or in glass bottles.
Each container must be marked with the following information:
a) Name and grade of the material;
b) Net mass of the material;
c) Date of manufacture;
d) Manufacturer’s name and/or his recognized trade-mark, if any; and
e) Batch number.
Containers of analytical reagent grade material should also be labelled with analytical data according to the revised standard.
BIS Certification Marking
The product(s) meeting the requirements of this standard may be certified under the conformity assessment schemes established under the provisions of the Bureau of Indian Standards Act, 2016 and the rules and regulations enacted thereunder and the products may be marked with the standard mark.
We acknowledge that the above information has been compiled from Bureau of Indian Standards (BIS).
