​​​Calcium Polysulfide has gained wide acceptance as a cost ​​effective reagent for permanent treatment of heavy metals in soil, water and air.

Calcium Polysulfide, commonly ​​known as Lime Sulfur, precipitates the highly soluble metals as less soluble, and non-toxic compounds. ​​The extend and rate of the precipitation is a function of the pH of the system.  Metal hydroxides change solubility with changes in pH.  Metal sulfides remain insoluble within a relatively wide pH range. Calcium Polysulfide typically forms sulfides with most metals and hydroxides in the case of chromium.   

Calcium Polysulfide has become a preferred reagent for in-situ remediation of chromium. Hexavalent chromium (VI) in the form of chromate (CrO4(2-)) is reduced to the insoluble form of trivalent chromium (Cr III), which is less toxic and tends to fall out of solution and adhere to soil.

​At Graus Chemicals, we take pride in supplying quality Calcium Polysulfide Solution, manufactured here in the United States with over 50 years of tradition and experience. ​​Whether you are looking for material in drums, totes or in bulk truckload quantities, our company can meet your needs.
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 Did you know...
  • ​​​​Calcium Polysulfide was first used for silver extraction by Kiss in 1860 (Kiss Process).
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  • ​​It is more stable and persistent in subsurface remediation than other metal reductants.​​
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  • ​​​It is used extensively in agriculture.
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  • ​​​​It is relatively safe to handle in the field.
Calcium Polysulfide



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