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PERFORMANCE OF GRANULAR CARBON FOR REMOVAL OF TRIAZINE AND ACETANILIDE HERBICIDES FROM WATER

KrishiKosh

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Title PERFORMANCE OF GRANULAR CARBON FOR REMOVAL OF TRIAZINE AND ACETANILIDE HERBICIDES FROM WATER
 
Creator YENGKHOM BIJEN KUMAR
 
Contributor Shashi Bala Singh
 
Subject costs, manpower, additives, marketing, livestock, fruits
 
Description T-8479
Pesticides are integral part of Indian agriculture. Residues of various pesticides are
being detected in surface and ground water due to their use in agriculture. Safe and clean
water is the requirement of human beings. Various water purification systems make use of
granular carbon. In this study performance of granular carbon has been evaluated for the
removal of two triazine herbicides i.e. atrazine and metribuzin and two acetanilide
herbicides i.e. alachlor and metolachlor.
Adsorption-desorption studies of atrazine, metribuzin, alachlor and metolachlor by
batch method indicated the highest adsorption of triazine than acetanilide herbicides.
Between atrazine and metribuzin, adsorption capacity of atrazine (Kf =17378) was found
more than metribuzin (Kf =16710) when studies individually. Similarly, metolachlor (Kf
=16033) has higher adsorption capacity than alachlor (Kf =4217). The trend of adsorption
was atrazine> metribuzin > metolachlor> alachlor. Similar trend was found when adsorption
studies were conducted with three sequential adsorption. The value of 1/n for alachlor
indicated that there was a proportionate increase in adsorption of alachlor with
concentration. The percent adsorption of alachlor was not affected by concentration. While
for metolachlor 1/n value (0.33) value of intercept indicates that adsorption does not increase
proportionately with concentration, although its adsorption intensity is more than alachlor.
Desorption studies revealed that atrazine, metribuzin and metolachlor were not desorbed, but
alachlor was desorbed in each cycles of desorption.
When adsorption was carried out with the mixture of these four herbicide,
metribuzin was the most adsorbed herbicide with a trend of metribuzin> atrazine> alachlor>
metolachlor. In mixture there remains a competition between herbicides for adsorption sites
and metribuzin having the more adsorption intensity (n= 2.30) than atrazine (n= 1.72) is
more adsorbed followed by metolachlor and alachlor. In desorption atrazine and metribuzin
were no desorbed and only metolachlor and alachlor were desorbed. Percent desorption of
alachlor was more than metolachlor. Although water solubility of metolachlor (488 μg mL-1)
is much higher than alachlor (242 μg mL-1), still alachlor was more desorbed which could be
explained on the basis of adsorption intensity of alachlor (n=1) which was lower than
metolachlor (n=3.). In column studies at higher concentration (1 and 5 μg mL-1), metolachlor
was highly detected herbicide with a trend of metolachlor> alachlor> atrazine> metribuzin.
But at lower concentration (0.1 μg mL-1), the most mobile and least adsorbed herbicide was
alachlor. More elution of metolachlor at higher concentrations may be due to the less
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available site of adsorption in the presence of higher concentration. The performance of
horizontal column was found better than vertical column.
 
Date 2016-11-24T09:42:49Z
2016-11-24T09:42:49Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/87342
 
Format application/pdf
 
Publisher IARI, Division of Agricultural Chemicals