standard-title FAQ


Question: What is PreciPAN®?

PreciPAN® is a complex inorganic solution of polysulfides and other sulfur-oxygen compounds.

Question: Who manufactures PreciPAN®?

PreciPAN® has been produced exclusively by PANchemie since 1986 and is supplied directly in canisters, barrels and containers.

Question: How does PreciPAN® react in the presence of hazards such as chlorine or cyanide in waste water?

Sodium thiosulfate dissolved in PreciPAN® is considered to be "antichlorine" and reduces Cl2 to chloride, cyanide is eliminated by the following reaction: CN- + S0 → SCN-followed by SCN- + Fe3+ → Fe(SCN)3 .

Question: What is PreciPAN® used for?

Used for the precipitation of dissolved, complex-bonded heavy metals such as Ag, Cd, Pb, Cu Hg, Ni, Zn from waste water. PreciPAN reduces chromate VI to trivalent chromium: 2 Cr04- +  3 H2S + 8 H2O → 3 S  + 2 Cr(OH)3 ↓ + 10 OH-  .

Question: How do PreciPAN® surpluses behave?

PreciPAN®, which is not used for precipitation, converts into sulphur and sulphate in the wastewater.

Question: What are the advantages of PreciPAN®?

PreciPAN® can be used in the entire pH range. Already in highly acidic medium, Hg can be converted into stable HgS (cinnabar). The sulphidic precipitation converts heavy metals into stable, hardly eluting sulphides.

Question: What are the ecological, toxicological and ecotoxicological properties of PreciPAN®?

PreciPAN® undiluted is classified as WGK 1, after or during application no more water hazardous substances are detectable. PreciPAN® is classified as R 22 Harmful if swallowed.Toxicity was tested against Danio Rerio Hamilton Buchanan; OECD 203/EU C. 1/DIN 38412 L15:96 h - no mortality detectable.

(Eco)toxicological data on PreciPAN®FS 401

Ecotoxicological studies
OECD 202; EU method C. 2 24h and 48h EC50i against Daphnia magna STRAUS:
The test shows no toxicity (see values below).

OECD 202; EU-Methode C.2 24h- und 48h EC50i gegen Daphnia magna STRAUS:
The test shows no toxicity (see values below).
24h-NOEC = 100 mg/L
48h-NOEC = 100 mg/L
24h-EC50i > 100 mg/L
48h-EC50i > 100 mg/L

OECD 203/EU C. 1/DIN 38412 L15 96 h toxicity to Danio Rerio Hamilton Buchanan:
The test showed no mortality.

OECD 209 Activated Sludge Breath Inhibition Test:
In preparation.

DIN 38412, Part 30 Toxicity of an aqueous sample to Daphnia magna STRAUS:
In dilution level (GD) = 1 there is no effect.

Classification in water hazard classes according to VwVwS (calculation of the laboratory Laus GmbH)
Water hazard class WGK 1, slightly hazardous to water

Persistence and degradability

PreciPAN®FS 401 does not contain any organic compounds and is converted into sulphate and sulphur by oxygen absorption from the air.
Biodegradability according to DOC acceptance: not applicable.

Oral toxicity

OECD Guideline No. 423 LD50. Oral rat 2000 mg/kg R 22 Harmful if swallowed.
General information
PreciPAN®FS 401 is highly alkaline (pH = 13.5) and should not be discharged undiluted into waste water. In diluted form, self-detoxification between pH 6 and 8.5 (i. e. under waste water conditions) is also rapidly anerobic. Any heavy metals that may be present are precipitated. The residual sulphide content is then less than 0.1 ppm.