DICHROMATE;DICHROMATE ION CHROMATOGRAPHY STANDARD;DICHROMATE, ION CHROMATOGRAPHY STANDARD SOLUTION;Dichromate, Ion chromatography standard solution, Cr;Dichromate, Ion chromatography standard solution, Specpure(R), Cr2O7-2 1000μg/ml;Dichromate, Ion chromatography standard solution, Specpure , Cr{2}O{7}|- 1000 g/ml;Dichromate, Ion chromatography standard solution, Specpure, Cr2O7- 1000g/ml
ACGIH: TWA 0.0002 mg/m3; STEL 0.0005 mg/m3 (Skin) OSHA: Ceiling 0.1 mg/m3 NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3
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DICHROMATE C화학적 특성, 용도, 생산
공업 용도
This is an orange, crystalline substance with a specific gravity of 2.68. Solubility in water is
11.7% at 20 °C. Both potassium and sodium dichromate are used in mineral processing.Dichromate solutions have an acid reaction because Cr2O72- ion reacts with water as follows:
H2O + Cr2O72- ? HCr2O4- + H+ + CrO4- Salts of chromic acid in acid medium are oxidants (Cr4- changes to Cr3- ). In principle,
dichromates are used in selective separation of copper–lead bulk concentrates, usually in
acid pH. A mixture of sodium dichromate and sodium silicate has shown to be an excellent
lead depressant during copper flotation from a bulk copper–lead concentrate containing
secondary copper minerals.
