尿素，Urea；puriss., meets analytical specification of Ph. Eur., BP, USP, 99.0-100.5%, 99.0-101.0% (calc. on dry substance)

等级

puriss.

质量水平

200

测定

99.0-100.5%
99.0-101.0% (calc. on dry substance)

形式

solid

质量

meets analytical specification of Ph. Eur., BP, USP

杂质

alkalic reac. substances, complies
≤0.001% heavy metals (as Pb)
≤0.04% insoluble in ethanol
≤0.05% ammonium (NH₄)
≤0.1% biuret(carbamylurea)

灼烧残渣

≤0.1% (as SO₄)

缺失

≤1.0% loss on drying, 105 °C, 1 h

mp

132-135 °C (lit.)
132-135 °C

溶解性

H₂O: soluble 480 g/L at 20 °C

密度

1.335 g/mL at 25 °C (lit.)

痕量阴离子

chloride (Cl^-): ≤10 mg/kg
sulfate (SO₄^2-): ≤50 mg/kg

痕量阳离子

Fe: ≤0.5 mg/kg

适用性

in accordance for appearance of solution
in accordance for identity

SMILES string

NC(N)=O

InChI

1S/CH4N2O/c2-1(3)4/h(H4,2,3,4)

InChI key

XSQUKJJJFZCRTK-UHFFFAOYSA-N