Sodium lactate - Content Analysis

Method One
Accurately weighed sample of about 3g, evaporated to dryness on a water bath, and then press the organic acid salt quantitative method (GT-2) was measured. Each mL 0.25mol / L sulfuric acid is equivalent to lactate (C3 H5NaO3) 56.03mg,,
Method Two
Accurately weighed sample equivalent to 300mg of Sodium lactate , add the 1 part of acetic anhydride and 5 parts of glacial acetic acid mixture consisting of 60ml, mix and let stand for about 20min. With 0.1mol / L perchloric acid in glacial acetic acid solution by potentiometric potassium lactate.  A blank test simultaneously and make the necessary corrections. Each mI0.1mol / L perchloric acid is equivalent to sodium lactate (C3 H5NaO3) 11.2lmg.