. 2016 Apr 20;47(3):563–570. doi: 10.1016/j.bjm.2016.04.009

Table 2.

Kinetic studies of chlorpyrifos degradation in various microbiologically active soils. The initial chlorpyrifos concentration was 200 mg kg⁻¹ soil.

Soil treatment	Regression equation	Δk (d⁻¹)^A	ΔV (mg kg⁻¹ d⁻¹)^B	T_1/2 (d)^D	R²^C
SS	ln(C_t/C₀) = −0.004t − 0.015	0.0053^a	0.84^a	130.7^l	0.983
nSS	ln(C_t/C₀) = −0.013t + 0.025	0.0111^b	2.01^b	62.45^k	0.985
PS	ln(C_t/C₀) = −0.016t + 0.042	0.0128^a	2.27^a	54.15^d	0.982

SS + JCp4	ln(C_t/C₀) = −0.063t + 0.231	0.0517^e	4.57^h	12.93^e	0.941
nSS + JCp4	ln(C_t/C₀) = −0.089t + 0.257	0.0688ⁱ	4.76^j	10.07^a	0.922
PS + JCp4	ln(C_t/C₀) = −0.092t + 0.194	0.088^c	5.69^b	7.86^a	0.944

SS + FCp1	ln(C_t/C₀) = −0.058t + 0.159	0.0476^g	4.40^g	14.56^f	0.953
nSS + FCp1	ln(C_t/C₀) = −0.078t + 0.173	0.064^h	4.76^j	10.83^b	0.972
PS + FCp1	ln(C_t/C₀) = −0.076t + 0.141	0.079^b	5.69^b	8.77^c	0.962

SS, sterilized soil; nSS, non-sterilized soil; PS, planted soil; +, inoculated with.

Linear equation between ln(Ct/C₀) of chemical data and time yielded regression equation and regression coefficient (R²).

Degradation rate constant (k) calculated using Ct = C₀ × e^−kt. Ct residual concentration of CP (mg kg⁻¹).

Chlorpyrifos disappearance rate.

Disappearance time calculated by T_1/2 = ln 2/k.