APPLICATION OF A POWDERED-INTERNAL-STANDARD METHOD TO PLANT AND SEAWEED SAMPLES

Abstract

A preparation method making use of liquid nitrogen combined with a powdered-internal-standard method has been established for seaweed and plant samples, whose elemental concentration has been attracting attention in various research fields. It is found that a powdered-internal-standard method developed by us is applicable to the powdered samples treated with liquid nitrogen with good accuracy and reproducibility. The results were compared with those obtained by direct-powder method and by chemical-ashing method and good agreement was obtained. In addition, it is found that the whole sample of large quantities was almost uniformized by this preparation method. Moreover, it becomes possible to obtain concentrations of all the concerned elements including iodine, chlorine and bromine, which are essential elements in the fields of life-sciences and are difficult to be analyzed by the chemical-ashing method. It is expected that the application to other biological samples is also promising.