Purity: (same/more than) 99.0%
Insoluble Matter: (same/less than) 0.01%
Chloride: (same/less than) 0.0005%
Nitrate and Nitrite (to pass test [about 0.005%]) Pass ACS
Copper: (same/less than) 0.002%
Substances not precipitated by Hydrogen sulfide: (same/less than) 0.05%
Iron: (same/less than) 0.001%
pH in a 30% solution: 4.7 to 5.8
Arsenic: 0.00003%
Sodium: (same/less than) 0.005%
Potassium: (same/less than) 0.005%
Calcium: (same/less than) 0.005%
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