Furthermore , the concentration in soil decreases exponentially by both erosion as chemical or biological degradation .
It takes one to three days for TEPP to decompose , which is usually the case for organophosphor - based insecticides .
The concentration in soil decreases exponentially by both erosion as chemical or biological degradation .
It takes one to three days for TEPP to decompose , which is usually the case for organophosphor - based insecticides .