等级

ACS reagent

质量水平

200

蒸汽压

0.01 mmHg ( 20 °C)

方案

≥99%
99.0-105.0% (ACS specification)

表单

powder or crystals

杂质

≤0.003% oxidizers
≤0.01% NH4OH pptd.
≤0.01% calcium chloride
≤0.01% insolubles

pH值（酸碱度）

4.5-8.5 (25 °C, 5%)

mp

176 °C (dec.) (lit.)

痕量阴离子

sulfate (SO42-): ≤0.01%

痕量阳离子

Ba: ≤0.005%
Fe: ≤0.001%
K: ≤0.01%
Mg: ≤0.005%
NH4+: ≤0.005%
Na: ≤0.02%
Sr: ≤0.1%
heavy metals: ≤5 ppm (by ICP)

储存温度

room temp