Effect of pH and temperature on the biodegradation of oxytetracycline, streptomycin, and validamycin A in soil

Applied Biological Chemistry

Table 1 Effect of soil pH on the degradation rates and half-lives of oxytetracycline (OTC), streptomycin (ST), and validamycin A (VA) in field soil (FS) and rice paddy soil (RS) at 23.0 ± 1.6 °C

Antibiotics	Soil	pH	Degradation rate (d⁻¹)	Half-life (d)
OTC	FS	5.5 ± 0.2	0.0705 ± 0.0097	4.8
		6.8 ± 0.1	0.0828 ± 0.0084	4.0
		7.4 ± 0.2	0.0829 ± 0.0117	4.1
	RS	5.5 ± 0.2	0.0997 ± 0.0130	3.5
		6.8 ± 0.1	0.0802 ± 0.0045	3.8
		7.4 ± 0.2	0.0898 ± 0.0114	3.7
ST	FS	5.5 ± 0.2	0.0054 ± 0.0052	22.1
		6.8 ± 0.1	0.0062 ± 0.0041	25.6
		7.4 ± 0.2	0.0016 ± 0.0015	169.4
	RS	5.5 ± 0.2	0.0074 ± 0.0017	33.5
		6.8 ± 0.1	0.0055 ± 0.0009	51.5
		7.4 ± 0.2	0.0022 ± 0.0011	143.4
VA	FS	5.5 ± 0.2	0.0808 ± 0.0095	4.0
		6.8 ± 0.1	0.1441 ± 0.0111	2.4
		7.4 ± 0.2	0.1365 ± 0.0076	2.1
	RS	5.5 ± 0.2	0.0599 ± 0.0128	5.5
		6.8 ± 0.1	0.0535 ± 0.0059	5.4
		7.4 ± 0.2	0.0897 ± 0.0073	3.5