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Heavy metals and residual agricultural chemicals in Bombyx mori silkworm cocoon for nontextile usages were examined. Proximate composition of silkworm cocoon was examined; contents of moisture, crude protein, crude fat, and ash were about 5 ~ 6%, 93 ~ 94%, 0.4 ~ 0.5%, and 0.3 ~ 0.4%, respectively. The Heavy metals were analyzed by ICP/MS after acid digestion. Arsenic, cadmium, and lead were not detected. The average contents of mercury, zinc, and cupric were 0.317, 3.99, and 2.06 mg/kg, respectively. Agricultural chemicals, such as dichlorvos and paraquart also were not detected. Silkworm cocoon may be safe used for nontextile applications.

Determination of Heavy Metals and Residual Agricultural Chemicals in Bombyx mori Silkworm Cocoon