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Appendices 1-18 to: Report on the Health Effects of Selected Pesticide Coformulants

Appendix 1: Manganese (II) sulphate, Manganese (II) sulphide1   General description

Because limited data are available specifically for manganese sulphate and manganesse sulphide, and most manganese compounds seem to cause the same adverse effects, this paper includes several studies with other inorganic manganese compounds.s

Manganese displays oxidation states: +2, +3, +4, +6 and +7. Compounds in which manganese is in its +2 oxidation state are the most stable ones, but bivalent manganese can be readily oxidized to the +3 and +4 states. (Beliles 1994).

 In this paper, the following manganese compounds are addressed:

Manganese (II) sulphate (MnSO₄)
Manganese (II) sulphide (MnS),
Manganese (II) chloride (MnCl₂)
Manganese (II, III) tetroxide (Mn₃O₄)
Manganese (III) trioxide (Mn₂O₃)
Manganese (III) phosphate (MnPO₄)
Manganese (IV) dioxide (MnO₂)

1.1  Identity

Molecular formula:          a) MnSO₄
                                      b) MnS

Structural formula:           a)

                                      b)
                                     

Molecular weight:            a) 151.00
                                       b) 87.00

CAS-no.:                        a) 7785-87-7
                                       b) 18820-29-6

Synonyms:                      a) Manganese sulphate
                                          Sulphuric acid, manganese (2⁺) salt (1:1)

                                       b) Manganese monosulphide

1.2   Physical / chemical properties

Description:                    a)  Manganese sulphate forms several hydrates. The
                                      article of commerce is usually a mixture of the
                                      tetra- and pentahydrates. The monohydrate exists
                                      in the form of pale red crystals.

                                     b)  Manganese sulphide is a pink, green or brown-
                                     green powder. Three crystalline modifications
                                     exist: a-form, green cubic crystals; b-form, red
                                     cubic crystals; g-form, red hexagonal crystals.

                                     In moist conditions manganese sulphide readily
                                     oxidizes in air to the sulphate.               

Melting point:                  a) 700°C

Boiling point:                   a) 850°C (decomposes)

Density:                          a) 3.25 g/ml    

Vapour pressure:             -

Concentration of

saturated vapours:           -

Solubility:                        a) Water:  520 g/l (at 5°C), 700 g/l (at 70°C) 

                                      b) Insoluble in water. Soluble in diluted acids.

References:                    ATSDR (2000), ChemFinder (2001), HSDB (2000),

                                      Merck Index (1996)

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