Akira Kimura

Simultaneous determination of heavy metals in waters by inductively-coupled plasma atomic emission spectrometry after extraction into diisobutyl ketone

Abstract Nebulization of more than thirty aliphatic and aromatic liquids into a low power (

Determination of ng ml-1 levels of phosphorus in waters by diisobutyl ketone extraction and inductively coupled plasma atomic emission spectrometry

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%.

Determination of submicrogram amounts of arsenic and antimony by d.c. plasma arc emission spectrometry

Abstract The application of a d.c. plasma arc to the determination of submicrogram amounts of arsenic and antimony is described. Arsenic or antimony hydride generated by reduction with granulated zinc or zinc powder is collected in a liquid nitrogen trap and then swept into the plasma. The effects of the argon gas flow rates, d.c. are current, acid concentration, etc. were investigated. The limits of detection are 8 ng for arsenic and 40 ng for antimony. The standard deviations are 3.5% for 0.5 μg As and 4.5% for 0.6 μg Sb Interference from nitric acid up to 0.3—0.5 M could be removed by adding chromium(II) The proposed method was applied to the analysis of waste water and sea water.

Indirect determination of sub-ng ml-1 levels of phosphorus in waters by di-isobutyl ketone extraction of reduced molybdoantimonylphosphoric acid an

Abstract Reduced molybdoantimonylphosphoric acid is extracted into di-isobutyl ketone (DIBK) and phosphorus in the extract is indirectly determined by inductively-coupled plasma emission spectrometric measurement of the Mo II 202.03-nm or Sb I 206.83-nm line. Washing of the extract with acid is unnecessary because of the low solubility of DIBK in water. Arsenic(III), Si, Ge, Fe(III) and most anions do not cause serious interference but arsenic(V) must be absent. The detection limits are 5.2 and 45 pg P ml-1, and the relative standard deviations for 1 μg of phosphorus are 2.0% and 2.5%, for molybdenum and antimony measurements, respectively. The method is applied in the analysis of river and seawater.

Determination of arsenic in sediments by chloride formation and d.c. plasma arc emission spectrometry

Abstract The sediment sample is heated in an induction furnace in hydrogen chloride—argon; arsenic trichloride evolved is trapped and then swept into a d.c. plasma arc. Calcium sulfate addition enhances the signals and suppresses interference from organic matter. The limit of detection is 15 ng As; the relative standard deviation is 3.4% ( n = 10) for 1.5μg As 2 0 3 .

Spectral Interference in a Vacuum Ultraviolet Region of ICP Atomic Emission Spectrometry.

Spectral interference from 65 elements (200μg ml-1) with the emission lines of 16 elements (5μg ml-1) in a vacuum ultraviolet (VUV) region was investigated. Spectral interference from Os was vely severe, possibly due to the use of a OsO4 solution which was volatile even at room temperature. In addition, it was revealed that the most sensitive As 193.76 nm line was subjected to spectral interference from Eu. For some elements such as Ca etc., emission lines in a VUV region were considered to be more useful than the conventional emission lines in a visible or violet region for the analysis of samples containing large amounts of coexisting elements.