lactic acid, USP标准如下:
TEST SPECIFICATION
IDENTITY PASS
SPECIFIC ROTATION -0.05 DEG TO +0.05 DEG
READILY CARBONIZABLE SUBSTANCES PASS
RESIDUE ON IGNITION NMT 0.05%
SUGARS PASS
CHLORIDE PASS
SULFATE PASS
HEAVY METALS NMT 0.001%
LIMIT OF CITRIC, OXALIC, PHOSPHORIC OR TARTARIC PASS
ASSAY 88.0% TO 92.0%
含量是88-92%,85%怎么解释就不知道了