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we are searching supplier for sodium (EDTA-4Na)FOR Water Purification purity : 99%Iron (Fe) °¤0.001%Heavy metal (Pb) °¤0.002%Chelate value (mgCaCO3/g) °¥215PH 10.5-11.5White crystal powder, soluble in water and acid, and not soluble in alcohol a Edta-4Na water purify edta-4Na water purify