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werkingsduur m
gen.	working time
environ.	persistence; persistence The capacity of a substance to remain chemically stable. This is an important factor in estimating the environmental effects of substances discharged into the environment. Certain toxic substances (e.g., cyanides) have a low persistence, whereas other less immediately toxic substances (e.g., many organochlorines) have a high persistence and may therefore produce more serious effects
life.sc.	biological persistence; residual activity

werkingsduur : 4 phrases in 2 subjects

Environment	3
Information technology	1