Abstract:A method for the determination of total phosphorus in soil and stream sediments by microwave digestion-phosphorus molybdenum blue spectrophotometry was established. The microwave digestion conditions were optimized as follows: the sample was digested at 150 ℃ for 15 min with HNO3-H2O2 (3∶1) as digestion agent. The effect of such factors as chromogenic acidity,interfering ions and measuring wavelength on the chromogenic system was investigated. The results showed that Beers law was complied in the acidity of 0.8 mol/L with absorption wavelength of 825 nm. The method was applied to soil and stream sediment reference material for analysis verification,the results were consistent with the certified values,and the relative standard deviation (RSD,n=6) was in the range of 0.9%-3.1%. In the determination of actual samples,the proposed method was compared with high-temperature fusion digestion-phosphorus molybdenum blue spectrophotometry and the results showed no significant discrepancy.
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TIAN Chun-qiu,SHAO Kun. Determination of total phosphorus in soils and stream sediments by microwave digestion-phosphorus molybdenum blue spectrophotometry. , 2013, 33(12): 52-56.
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