... carbonate—light(RECOMMENDATION) Typical Chemical AnalysisHigh-class1st-gradeQualifiedTotal bases(as Na2CO3), % ≥99.2 98.898.0Chloride(as NaCl),% ≤ 0.70 ... 1.01.2 sodium carbonate--denseItemHigh-class1st-gradeTotal alkali(as Na2CO3), % ≥ 99.1 98.8Chloride(as NaCl),% ≤ 0.70 0 ... .0 65.0 sodium carbonate--for edibleItem IndexTotal bases(as Na2CO3), % ≥ 99.2Chloride(as NaCl),% ≤ 0.7Fe % ≤ 0.0040Heavy metals ...