Determination of ng ml-1 levels of phosphorus in waters by diisobutyl ketone extraction and inductively coupled plasma atomic emission spectrometry |
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Authors: | Akira Miyazaki Akira Kimura Yoshimi Umezaki |
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Institution: | National Research Institute for Pollution and Resources, Yatabe, Ibaraki, 305 Japan |
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Abstract: | Reduced molybdoantimonylphosphoric acid is extracted into diisobutyl ketone (DIBK) and phosphorus in the extract determined by i.c.p. emission spectrometry at the P I 214.91-nm line. The Mo II 213.61 nm line interfered with the P I 213.62-nm line. The method is applied to 0.2–200 μg of phosphorus in 500 ml of river or sea water. Arsenic(III), Si, Ge, Fe(III) and most anions do not interfere, but As(V) >10 × P) causes positive errors. The detection limit is 0.37 ng P ml-1, and the relative standard deviation for 5 μg of phosphorus is 2.1%. |
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