The Bureau of Indian Standards (BIS) recently released the draft of Manganese Sulphate Monohydrate — Specification (First Revision), proposing amendments to the current standard. The public can submit comments or suggestions before March 30, 2026.
Scope and Major Changes
Manganese sulphate monohydrate is a chemical widely used in the manufacture of animal feed, paints, varnishes, electroplating, textiles, ceramics, paper, and dry cells. The standard was initially published in 1983. This revision updates the specifications for manganese sulphate monohydrate and introduces instrumental test methods as optional procedures for determining the content of iron, lead, arsenic, calcium, and chlorides. Additionally, clauses for normative references have been added, and the requirements for packaging and marking have been updated.
Grades and Specification Requirements
The draft classifies the product into two grades:
- Grade 1 (Pure Grade): Final product obtained directly from manufacturing.
- Grade 2 (Industrial Grade): By-product obtained during the manufacturing process.
The draft specifies packaging and marking requirements. The product shall be packed in polyethylene laminated jute bags or any other agreed-upon packaging method. Each package must be clearly and permanently marked with the name and grade of the material, the manufacturer's name and registered trademark, gross and net weight, date of packing, and batch number.
The requirements for manganese sulphate monohydrate are detailed in the table below:
|
Characteristic |
Requirements |
|
|
Grade 1 |
Grade 2 |
|
|
Manganese sulphate (as MnSO4.H2O), % by mass |
97.0 ～ 98.0 |
83.0 ～ 85.0 |
|
Manganese (as Mn), % by mass |
31.60 ～ 31.95 |
27.01 ～ 27.70 |
|
Insoluble matter, % by mass |
0.2 |
0.5 |
|
Chloride (as Cl), % by mass |
0.03 |
0.03 |
|
Magnesium and alkali metals (as SO4), % by mass |
0.6 |
– |
|
Calcium (as Ca), % by mass |
0.2 |
– |
|
Zinc (as Zn), % by mass |
0.05 |
0.05 |
|
Iron (as Fe), % by mass |
0.005 |
0.08 |
|
Heavy metals (as Pb), % by mass |
0.002 |
0.05 |
|
Arsenic (as as), % by mass |
0.0005 |
– |
|
Oxygen absorbed from permanganate (as O), % by mass |
0.0008 |
– |
|
Ammonium sulphate [as (NH4)2SO4], % by mass |
– |
15 |
