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

Appendix 7: Sodium ligninsulphonate 
48     General description

Sodium ligninsulphonate is a by-product of the sulphite pulping process for paper. Commercial formulations are mixtures of sodium ligninsulphonates and wood sugars.

48.1     Identity

Molecular formula:          -

Structural formula:          

Molecular weight:            250-100000

CAS-no.:                        8061-51-6

Synonyms:                             Lignosulphonic acid, sodium salt

                                             Sodium lignosulphonate

                                      Sodium lignosulphonic acid

                                      Sulphonated lignin sodium salt

48.2     Physical / chemical properties

Description:                            Sodium ligninsulphonate is a light tan to dark brown

                                      nonhygroscopic powder with no pronounced odour.

Melting point:                  No definite melting point.

Boiling point:                   Decompose above 200 °C.

Density:                          -

Vapour pressure:             -

Concentration of

saturated vapours:           -

Solubility:                        Sodium ligninsulphonate forms colloidal solutions or dispersions in water. It is practically insoluble in all organic solvents. The pH of a 1:100 solution is approximately between 3 and 8.

References:                    Aldrich Chemical Co., Inc. (2001), ChemFinder (2001), Committee on Food Chemicals Codex (1996), HSDB (2000), RTECS (2000), Ward & Tankersley (1980).

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