Persistence of bifenthrin in tea and its transfer from black tea to tea brew  

Seenivasan S.1 , Muraleedharan N.2
1.The Institute of Environmental and Human Health, Texas Tech University, Lubbock–79415, Texas, USA
2.Tea Research Association, Tocklai Tea Research Institute, Jorhat-785008, Assam, India
Author    Correspondence author
Journal of Tea Science Research, 2015, Vol. 5, No. 9   doi: 10.5376/jtsr.2015.05.0009
Received: 11 Sep., 2015    Accepted: 23 Oct., 2015    Published: 08 Dec., 2015
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This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:

Seenivasan S., Muraleedharan N., 2015, Persistence of bifenthrin in tea and its transfer from black tea to tea brew, Journal of Tea Science Research, 5(9), 1-7 (doi: 10.5376/jtsr.2015.05.0009)

Abstract

Field experiments were conducted at two places in Tamil Nadu (India) to determine the residues of bifenthrin in black tea. Residues were quantified at different harvest intervals of ‘0’ (3 hr), 1st, 3rd, 5th, 7th, 10th and 14th day after acaricide application. Persistence, dissipation pattern, half-life value and safe harvest interval of the acaricide in tea were calculated. Residues of bifenthrin dissipated exponentially after application at both the locations and reached below the European Union maximum residue limit (MRL) of 5 mg kg-1 on the 10th day. Bifenthrin showed that like other acaricides it followed the first order dissipation kinetics. Half-life values varied from 2.4 to 3.2 days for bifenthrin and a safe harvest interval of 10 days is suggested for tea at the recommended dosage.

Keywords
Bifenthrin; Brew;Residues; Persistence; Dissipation; MRL
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