| 水环境磷的灰化法测定中不同灰化助剂的效果比较 |
| 摘要点击 933 全文点击 1116 投稿时间：2001-08-24 修订日期：2001-10-06 |
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| 中文关键词 磷 灰化法 测定 磷酸二氢钠 偏磷酸钠 灰化助剂 |
| 英文关键词 phosphorus ignition method determination sodium phosphate monobasic sodium metaphosphate ashing auxiliary |
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| 中文摘要 |
| 以磷酸二氢钠和偏磷酸钠为磷标样,对加入不同盐试剂(灰化助剂)经不同温度(150℃～550℃)灼烧后磷的回收率进行了比较.所研究的灰化助剂除文献中报道过的MgSO4和Mg(NO3)2外,还对MgCl2等10余种盐试剂进行了实验.结果发现,磷酸二氢钠和偏磷酸钠加入MgSO4在常规的灼烧温度下灼烧,用0.2mol/L HCl于80℃浸提0.5h不能使磷全部回收,而MgCl2、MgA |
| 英文摘要 |
| Researches on phosphorus recoveries from NaH2PO4 and (NaPO3)n(n≥2) after ignition at temperature from 150℃ to 550℃ with auxiliary, such as MgSO4, Mg(NO3)2, MgCl2, MgAc2, CaCl2 and so on, were finished. It was found that the phosphorus can not be completely recovered when NaH2PO4 or (NaPO3) n (n≥2) was ignited together with MgSO4 at routine ashing temperature (500℃) with the final mixture extracted with 0.2/sub> mol/L HCl at 80℃ for 0.5h. In contrast, MgCl2,MgAc2, Mg(NO3)2 and CaCl2 can all make the phosphorus recoveries completely. MgCl2 (or MgAc2) rather than MgSO4 in the research was suggested. To be utilized as ashing auxiliary in the phosphorus determination with ignition method. Although Mg(NO3)2 is a highly effective auxiliary, yet danger of explosion, toxicity of nitrogen dioxide and more manipulation steps may impede its widespread utilization. |
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