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 CHEMICAL
CONTROL Every year, several new bio formulations,
synthetic acaricides/ insecticides and insect growth
regulators are screened for their biological efficacy
against various pests of tea. Experiments are also
being carried out on taint, phytotoxicity and effect
of pesticides on natural enemies of tea pests.
 PESTICIDE
RESIDUE laboratory attached to the division
is well equipped with all sophisticated analytical
instruments for the estimation of residues of pesticides
and heavy metals in green leaves, black tea and
tea infusion. The lab has been accredited by NABL
in accordance with the ISO/IEC
17025:1999 standards by the DST, Govt. of
India under chemical testing guidelines.
The graphite furnace Atomic Absorption Spectrometer
coupled with hydride generator, micro wave digestion
unit is used for measuring the presence of heavy
metals viz., lead (Pb), Cadmium (Cd), Chromium (Cr)
and Mercury (Hg) in parts per billion level (ppb)
in tea and in agro inputs.
The Gas Chromatograph with flame ionization detector
(FID), nitrogen phosphorus detector (NPD) and electron
capture detector (ECD) coupled with head space auto
sampler and High Performance Liquid Chromatograph
equipped with diode array detector (DAD) and fluorescent
detector (FLD) is used for the qua ntification
of pesticide residues viz., ethion, Dicofol, quinalphos,
chlorpyrifos, endosulfan, Deltamethrin, Propargite,
fenpropathrin, lambdacyhalothrin, fenvalerate, beta
cyfluthrin, bifenthrin, Cypermethrin, hexaconazole,
DDT, fenazaquin, fenpyroximate, Imidacloprid, profenofos
& tebuconazole in parts per million level (ppm).
Every year several field experiments are being conducted
to generate data on the pattern of degradation of
different insecticides/acaricides/fungicides/weedicides
to establish MRLs on processed tea. |
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