Supercritical water decomposition of polyethylene samples for the determination of their trace cadmium content.
A novel pretreatment method has been developed for determination of toxic metals in plastic materials by their decomposition under supercritical water conditions. Particularly, quantitative analysis of cadmium in polyethylene has been demonstrated using inductively coupled plasma atomic emission spectrometry combined with supercritical water treatment. All the cadmium in a polyethylene sample was obtained as an aqueous solution by the treatment with supercritical water containing 12.4% of hydrogen peroxide at 673 K. Although a complete recovery of the aqueous solution from the reactors has not yet been attained, we verified that the present method was effective and promising for quantitative analysis of trace amounts of hazardous metals in plastic materials.
Sato
Osamu
O
Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Sendai.
Konno
Masanori
M
Wakui
Yoshito
Y
Matsunaga
Hideyuki
H
Shirai
Masayuki
M