Atomic Absorption Spectrophotometric

Siong, T. E., Choo, K. W., and Shahid, S. M. (1989a). Determination of calcium in foods by the atomic absorption spectrophotometric and titrimetric method. Pertanika 12, 303-311. 

Lum and Callaghan [ 140 ] did not use matrix modification in the electother-mal atomic absorption spectrophotometric determination of cadmium in seawater. The undiluted seawater was analysed directly with the aid of Zeeman effect background correction. The limit of detection was 2 ng/1. 

Courtot-Coupez and Le Bihan [209,210] determined non-ionic detergents in sea- and fresh-water samples at concentrations down to 2 pg/1 ppm by benzene extraction of the tetrathiocyanatocobaltate (II) (NH4)2 (Co(SCN)4) [ 182] detergent ion-pair, followed by atomic absorption spectrophotometric determination of cobalt [209]. 

The atomic absorption spectrophotometric methods discussed in section 12.10.2.2 [122, 124] has been applied to the determination of selenium in sediments. Itoh et al. [165] and Cutter [122] (section 12.10.2.2) have used hydrogen generation-atomic absorption spectrophotometric techniques to determine selenium in non-saline sediments. Cutter [122] was able to distinguish between selenite, selenate, total selenium and organic selenium in sediments. 

Therefore, it is difficult or impossible to relate the ash obtained from a food with its salts system, and low values are obtained for certain mineral elements by analysis of the ash compared to direct analysis of the intact food. Titrimetric, colorimetric, polarographic, flame photometric and atomic absorption spectrophotometric techniques are frequently used to analyse for the various mineral constituents however, the quantitative estimation of... 

Haring et al. [31] determined arsenic and antimony by a combination of hydride generation and atomic absorption spectrometry. These workers found that, compared to the spectrophotometric technique, the atomic absorption spectrophotometric technique with a heated quartz cell suffered from interferences by other hydride-forming elements. 

Various atomic absorption spectrophotometric procedures have been described for the determination of mercury in soils. Methods based on attacking the mercury in soil samples with mineral acids and permanganate have been shown to give low mercury recoveries. In recent years methods based on decomposition of the sample by heating have gained favour in that they obviate any tendency to produce low results. 

Lopez Garcia et al., [24] suspended soil samples in water containing 5% (v/v) concentrated hydrofluoric acid before injection into an electrothermal atomic absorption spectrophotometric system. No modifier other than the hydrofluoric acid was required for the determination of lead, cadmium and thallium. 

AOAC. 1984b. Tin in food Atomic absorption spectrophotometric method. In AOAC official methods of analysis, 474. 

Cold vapor atomic absorption spectrophotometric method is applicable only for the mercury analysis. The principle of this method is described below. 

Maguire, R.J. and Tkacz, R.J. (1983) Analysis of butyltin compounds by gas chromatography. Comparison of flame photometric and atomic absorption spectrophotometric detectors./. Chromatogr., 268, 99-101. 

Olayinka, K.O., Haswell, S.J. and Grzeskowiak, R. (1989) Speciation of cadmium in crab-meat by reversed-phase high-performance liquid chromatography with electrothermal atomisation atomic absorptive spectrophotometric detection in a model gut digestive system. J. Anal. At. Spectrom., 4, 171-175. 

Atomic absorption spectrophotometric analysis and kinetic analysis of wild-type 1,2-a-D-mannosidase were performed. Concentrations of Ca2+ were determined by atomic absorption spectrophotometric analysis. The purified recombinant wild type 1,2-a-D-mannosidase almost completely did not contain Ca2+. Other divalent metal cations including Mg2+, Mn2+, Co2+, Cu2+, and Zn2+ were also not detected. 

Table 23. Atomic absorption spectrophotometric determination of copper content for wild-type and mutant tyrosinases from A. oryzae expressed in E. coli...

R. M. Pollman, Atomic absorption spectrophotometric determination of calcium and magnesium and colorimetric determination of phosphorus in cheese collaborative study, J. Assoc. Off. Anal. Chem., 74 (1991), 27 -31. 

Lead Determine as directed for Method I in the Atomic Absorption Spectrophotometric Graphite Furnace Method under Lead Limit Test, Appendix IIIB. 

Lead Determine as directed for Method I in the Atomic Absorption Spectrophotometric Graphite Furnace Method under Lead Limit Test, Appendix IIIB, using a 10-g sample. Oxalate Neutralize 10 mL of a 1 10 aqueous solution with 6 N ammonium hydroxide, add 5 drops of 2.7 N hydrochloric acid, cool, and add 2 mL of calcium chloride TS. No turbidity develops. 

Assay Dissolve about 500 mg of sample, accurately weighed, in 25 mL of 50% alcohol previously neutralized with 0.1 IV sodium hydroxide, add phenolphthalein TS, and titrate with 0.1 IV sodium hydroxide. Each milliliter of 0.1 A sodium hydroxide is equivalent to 12.21 mg of C7H602. Lead Determine as directed in the Flame Atomic Absorption Spectrophotometric Method under Lead Limit Test, Appendix IIIB, using a 10-g sample. 

---