Distribution of thifluzamide, fenoxanil and tebuconazole in rice paddy and dietary risk assessment

Abstract

Distribution behaviors of thifluzamide, fenoxanil, and tebuconazole applied to rice were investigated in South China. Analysis was by a modified QuEChERS method with gas chromatography (thifluzamide and fenoxanil) and liquid chromatography mass spectrometry (tebuconazole). Thifluzamide and tebuconazole partitioned mainly into the soil, with half-lives in the paddy soil of 12–14 and 5.3–7.8 days, respectively. Fenoxanil partitioned mainly into the rice plants, with half-lives of 3.3–4.4 days. The half-lives of thifluzamide, fenoxanil, and tebuconazole in paddy water were 0.17–0.89, 1.8–3.0, and 1.6–4.0 days, respectively. The residues in rice grains at the pre-harvest interval of 14 days were all below the established maximum limit values. The dietary risks assessed as hazard quotients at the pre-harvest interval were less than 1.

Keywords:

• distribution
• risk assessment
• thifluzamide
• fenoxanil
• tebuconazole

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplemental data

Supplemental data for this article can be accessed at http://dx.doi.org/10.1080/02772248.2015.1113288.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number 31101458].