A comparison of efficiency of different assistants used in phosphorus determination by ignition method with Na4p2O7 as standard phosphorus

ZHOU Yi; ZHANG Fu-sui; MA Xi-nian; YANG Hong-sheng; HE Yi-chao

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ZHOU Yi, ZHANG Fu-sui, MA Xi-nian, YANG Hong-sheng, HE Yi-chao. A comparison of efficiency of different assistants used in phosphorus determination by ignition method with Na4p2O7 as standard phosphorus[J]. Haiyang Xuebao, 2001, 23(5): 58-64.

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ZHOU Yi, ZHANG Fu-sui, MA Xi-nian, YANG Hong-sheng, HE Yi-chao. A comparison of efficiency of different assistants used in phosphorus determination by ignition method with Na₄p₂O₇ as standard phosphorus[J]. Haiyang Xuebao, 2001, 23(5): 58-64.

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A comparison of efficiency of different assistants used in phosphorus determination by ignition method with Na₄p₂O₇ as standard phosphorus

Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2000-02-24
Rev Recd Date: 2001-01-21

Abstract

Abstract

Resear ches on phosphorus recoveries from sodiumpy rophosphate(Na₄P₂O₇) after ignition at temper ature from 200 to 550℃ with auxiliary,such as MgSO₄,Mg(NO₃)₂,MgCl₂,MgAc₂,CaCl₂,Ca(NO₃)₂ and so on,are finished.The results indicate that MgSO₄ gives poor phosphorus recovery at any ignition temperature from 200 to 550℃,when the final residue is extracted with 0.2 mol/dm³ HCl at 80℃ for 30 min.By contrast,Mg(NO₃)₂, MgCl₂,MgAc₂,CaCl₂ and Ca(NO₃)₂ give very good phosphorus recovery with ignition temperature being equal to or greater than 450℃.It is sugg ested that MgCl₂(or MgAc₂) rather than MgSO₄ can be used as ashing assistant in the phosphorus determination by ignition method.
- phosphorus determination,
- ignition method,
- Na₄p₂O₇,
- ashing assistant

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References(16)

References

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