OMB First to Final Action Recommendation Checklist 11-12-18

3/9/2017

An exclusive cleanup column for tea has been optimized and selected by a comparative study of the cleanup results from 6 cleanup materials.  a three-group Cleanert TPT Cartridge has been developed, which has a unique cleanup effect on 653 chemical compounds in tea.

removes the pigments in tea without absorbing the target pesticides

PestiCarb (PC)

removes foreign matters such as volatile organic acids, tea polyphenol, etc.

removes pigments and foreign matters other than theophylline

Cleanert TPT

Patent number: 201310056873X

polyamine silica

Amide polystyrene

Correlation comparison of fortified recoveries of 456 pesticides with pesticide logKow values with the three methods of M1, M2 and M3  Special study on the effect of tea hydration on the efficiency of the analytical method 329 out of 456 pesticides have been found to have logKow values (logKow range: -0.75 ～ +8.20) . A scatter diagram is drawn with logKow as horizontal ordinate and recoveries as vertical ordinate, and a chart of correlations of recoveries for the three methods at three fortification levels with pesticide polarities is derived. The pesticide number within 70-120% recovery at three fortification levels

M1

M2

M3

Diagram of correlation distribution of pesticide recoveries with logKow within the range of -0.77 ～ 8.20 at three fortification levels of M1, M2 and M3

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