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科倫多牌食品級焦磷酸鈉-無水-十水-顆粒-粉末-藥用級試劑級
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質(zhì)量指標(biāo) | Specification | GB25557-2010 | FCCVII | ||||
含量 | 無水(Na4P2O7),w/% | Assay | Anhydrous, (Na4P2O7),w/% | 96.5-100.5 | 95.0-100.5 | ||
十水(Na4P2O7 ·10H2O),w/% ≥ | Decahydrate, (Na4P2O7·10H2O),w/% ≥ | 98.0 | ———— | ||||
水不溶物,w/% ≤ | Insoluble Substances,w/% ≤ | 0.2 | 0.2 | ||||
pH值(10g/L溶液,25℃) | pH value (10g/L,25℃) | 9.9-10.7 | ———— | ||||
正磷酸鹽,mg/kg ≤ | Orthophosphate,mg/kg ≤ | 通過試驗(yàn) | ———— | ||||
砷(以As計(jì)),mg/kg ≤ | Arsenic (As As) ,mg/kg ≤ | 3 | 3 | ||||
重金屬(以Pb計(jì)),mg/kg ≤ | Heavy Metal (As Pb),mg/kg ≤ | 10 | ———— | ||||
鉛(Pb),mg/kg ≤ | Lead (as Pb),mg/kg ≤ | 4 | 4 | ||||
氟化物(以F計(jì)),mg/kg ≤ | Fluoride (As F),mg/kg ≤ | 50 | 50 | ||||
灼燒失重, w/% | 無水物 ≤ | Loss on Ignition, w/% | Anhydrous ≤ | 0.5 | 0.5 | ||
十水合物 | Decahydrate | 38.0-42.0 | 38.0-42.0 |