ITEM               TECHNICAL INDEX Best Quality First Quality Qualifier Assay, % ≥ 98.0 95.0 90.0 NaOH,% ≤ 0.5 0.7 1.0 Na2CO3,% ≤ 0.3 0.5 1.00 NaCL,% ≤ 0.3 0.5 2.0 Na2S,% ≤ 0.08 1.0 1.0 Moisture,% ≤ 0.5 1.0 1.5