抄録
Optimum conditions for the determination of trace amount of boron in water samples were established with inductively coupled plasma-atomic emission spectrometry (ICP-AES) and a detection limit of 2μgB/l was obtained at the BI 249.77 nm. Spectral intensity was reduced with increasing concentration of acids (hydrochloric, nitric and sulfuric acids) above 0.5 wt% due probably to the change of physical property of the nebulized solution. Concentrations of concomitants such as NaCl, KCl, MgCl2 and CaCl2 were little influenced on spectral intensity up to 3000 mg/l. Spectral interference was observed by the presence of large amount of iron. However, BI 249.77 nm line yielded the same net intensity regardless of iron concentration. Boron in river water, industrial waste water, disposal plant sewage and sea water was determined satisfactorily by direct nebulization after filtration. The results obtained by ICP-AES method were in good agreement with those obtained by modified curcumin method after alkali fusion. The ICP-AES method is recommended as an alternative analytical method for the rapid determination of boron in the above samples.
