Table 2. Pesticide transformation products measured during the U.S. Geological Survey National Water-Quality Assessment Program’s Agricultural Chemicals Team studies.


[–, information not available; μg/L, micrograms per liter]


Analyte	Chemical registry No.	Matrix	PCODE	Parent compound	Method reporting limit (µg/L)
Amide Herbicides1
Acetochlor ESA	–	water, filtered	61029	Acetochlor	0.02
Acetochlor OXA	–	water, filtered	61030	Acetochlor	.02
Acetochlor SAA	–	water, filtered	62847	Acetochlor	.02
Acetochlor ESA - secondary amide	–	water, filtered	62850	Acetochlor	.02
Alachlor ESA	–	water, filtered	50009	Alachlor	.02
Alachlor ESA - secondary amide	–	water, filtered	62849	Alachlor	.02
Alachlor OXA	–	water, filtered	61031	Alachlor	.02
Alachlor SAA	140939-16-8	water, filtered	62848	Alachlor	.02
2-Chloro-2,6-diethylacetanilide	6967-29-9	water, filtered	61618	Alachlor	.005
2,6-Diethylaniline	579-66-8	water, filtered	82660	Alachlor	.006
Dimethenamid ESA	–	water, filtered	61951	Dimethenamid	.02
Dimethenamid OXA	–	water, filtered	62482	Dimethenamid	.02
Flufenacet ESA	–	water, filtered	61952	Flufenacet	.02
Flufenacet OXA	–	water, filtered	62483	Flufenacet	.02
Metolachlor ESA	–	water, filtered	61043	Metolachlor	.02
Metolachlor OXA	–	water, filtered	61044	Metolachlor	.02
2-[(2-Ethyl-6-methylphenyl) amino]-1-propanol	61520-53-4	water, filtered	61615	Metolachlor	.1256
2-Ethyl-6-methylaniline	24549-06-2	water, filtered	61620	Metolachlor	.0045
Propachlor ESA	–	water, filtered	62766	Propachlor	.05
Propachlor OXA	–	water, filtered	62767	Propachlor	.02
Organophosphate Insecticides
Azinphos-methyl-oxon	961-22-8	water, filtered	61635	Azinphos-methyl	0.07
Chlorpyrifos, oxygen analog	5598-15-2	water, filtered	61636	Chlorpyrifos	.0562
Diazoxon	962-58-3	water, filtered	61638	Diazinon	.01
Ethion monoxon	17356-42-2	water, filtered	61644	Ethion	.0336
Fenamiphos sulfone	31972-44-8	water, filtered	61645	Fenamiphos	.007
Fenamiphos sulfoxide	31972-43-7	water, filtered	61646	Fenamiphos	.031
Fonofos, oxygen analog	944-21-8	water, filtered	61649	Fonofos	.0021
Malaoxon	1634-78-2	water, filtered	61652	Malathion	.008
Methyl paraoxon	950-35-6	water, filtered	61664	Methyl parathion	.0299
Phorate oxon	2600-69-3	water, filtered	61666	Phorate	.0973
Phosmet oxon	3735-33-9	water, filtered	61668	Phorate	.0553
Terbufos sulfone, oxygen analogue	56070-15-6	water, filtered	61674	Terbufos	.0676
Triazine Herbicides
Deethylatrazine (CIAT)	6190-65-4	water, filtered	04040	Atrazine	0.006
Miscellaneous Pesticides (use)
1-Naphthol	90-15-3	water, filtered	49295	Carbaryl	.0882
3,4-Dichloroaniline	95-76-1	water, filtered	61625	Linuron	.0045
4-Chloro-2-methylphenol	1570-64-5	water, filtered	61633	MCPA/MCPB	.0056
AMPA ((Aminomethyl)phosphonic acid )	1066-51-9	water, filtered	62649	Glyhosate	–
Desulfinylfipronil	–	water, filtered	62170	Fipronil	.012
Desulfinylfipronil amide	–	water, filtered	62169	Fipronil	.029
Fipronil sulfide	120067-83-6	water, filtered	62167	Fipronil	.013
Fipronil sulfone	120068-36-2	water, filtered	62168	Fipronil	.024

¹Analytical results for amide herbicide products are from analyses performed at the USGS Organic Geochemistry Research Laboratory.

First posted June 23, 2011