Conceal disturbing elements like iron, copper, lead with hydrogen fluoride amine-EDTA, add the potassium iodide to separate iodine, and take starch as indicator, titrate with sodium hyposulfite.
3
就是自来水也必定含有各种有害物质，如氯、氯胺、石棉、杀虫剂、氟化物、铜、铅等。
Even tap water invariably contains a variety of poisons such as chlorine, chloramine, asbestos, pesticides, fluoride, copper, mercury, and lead.
点击反馈