7440-47-3

外观性质钢灰色、质脆而硬的金属。

外观性状略带暗灰色的银白色金属（体心立方晶系）。 溶于稀硫酸、盐酸，不溶于水、硝酸、王水。

溶解性不溶于水，不溶于硝酸，溶于稀盐酸、硫酸。

熔点4 °C

沸点82 °C

密度7.14 g/mL at 25 °C(lit.)

闪点50 °F

储存条件no restrictions.

溶解度reacts with dilute acid solutions

形态powder

形态粉末

比重7.2

颜色银灰

PH值<1 (H2O, 20°C)

气味 (Odor)Odorless

电阻率 (resistivity)12.7 μΩ-cm, 20°C

水溶解性Insoluble in water.

Merck13,2252

暴露限值TLV-TWA: chromium metal 0.5 mg/m³ (ACGIH and MSHA), 1 mg/m³ (OSHA); Cr(II) and Cr(III) compounds 0.5 mg/m³ (ACGIH); Cr(VI) compounds, water soluble and certain water insoluble, 0.05 mg/m³ (ACGIH).

稳定性稳定的。与碳酸盐、强碱、无机酸、锂、二氧化硫、强酸不相容。

(IARC)致癌物分类3 (Vol. Sup 7, 49) 1990

警示词警告

危险品运输编号UN 2924 3/PG 2

WGK Germany3

RTECS号GB4200000

自燃温度580°C

TSCAYes

海关编码8112 21 90

危险等级4.1

包装类别III

毒性Elemental chromium and certain chromium compounds have been designated as carcinogens, hazardous substances, hazardous waste constituents, and priority toxic pollutants. Some of those compounds designated as hazardous are chromic acetate, chromic acid, chromic sulfate, and chromous chloride. Although chromium in the 6+ state is regarded as being the most carcinogenic, there are 6+ compounds that appear to be non-carcinogenic. In addition to their possible carcinogenicity, chromium compounds may have local allergic effects leading to dermatitis. Systemically, 6+ chromium compounds are irritants to the respiratory system and may give rise to pulmonary edema.

立即威胁生命和健康浓度250 mg Cr/m3