DL-Яблочная кислота

ITEM

STANDARD

Assay, %

99.0～100.5

Specific rotation

-0.1～+0.1

Melting range, ℃

127-132

Water insolubles, %

≤0.1

Sulphated ash, %

≤0.1

Fumaric acid, %

≤1.0

Maleic acid, %

≤0.05

Heavy metals, ppm

≤10

As

≤2

Pb

≤2

Hg

≤1

Identification

IR absorption