Home

Search Results

Potential impacts of seasonal variation on atrazine and metolachlor persistence in andisol soil.

Potential impacts of seasonal variation on atrazine and metolachlor persistence in andisol soil.

Environmental monitoring and assessment (2015-11-20)

Piyanuch Jaikaew, Julien Boulange, Dang Quoc Thuyet, Farag Malhat, Satoru Ishihara, Hirozumi Watanabe

ABSTRACT

To estimate the potential effect of seasonal variation on the fate of herbicides in andisol soil, atrazine and metolachlor residues were investigated through the summer and winter seasons during 2013 and 2014 under field condition. The computed half-lives of atrazine and metolachlor in soil changed significantly through the two seasons of the trial. The half-lives were shorter in summer season with 16.0 and 23.5 days for atrazine and metolachlor, respectively. In contrast, the half-lives were longer during the winter season with 32.7 and 51.8 days for atrazine and metolachlor, respectively. The analysis of soil water balance suggested that more pesticide was lost in deeper soil layers through infiltration in summer than in winter. In addition, during the summer season, metolachlor was more likely to leach into deeper soil layer than atrazine possibly due to high water solubility of metolachlor.

MATERIALS

Product Number

Brand

Product Description

565423

Sigma-Aldrich

Acetonitrile solution, contains 0.035 % (v/v) trifluoroacetic acid, suitable for HPLC

53663

Sigma-Aldrich

Activated Charcoal Norit^®, Norit^® SX ultra, from peat, corresponds U.S. Food chemicals codex (3rd Ed.), steam activated and acid washed, highly purified, powder

22874

Sigma-Aldrich

Activated Charcoal Norit^®, Norit^® PK 1-3, from peat, steam activated, granular

29204

Sigma-Aldrich

Activated Charcoal Norit^®, Norit^® RB3, for gas purification, steam activated, rod

93067

Sigma-Aldrich

Activated Charcoal Norit^®, Norit^® SX2, powder, from peat, multi-purpose activated charcoal, steam activated and acid washed

97876

Sigma-Aldrich

Activated Charcoal Norit^®, Norit^® CA1, wood, chemically activated, powder

574732

Sigma-Aldrich

Acetonitrile solution, contains 0.1 % (v/v) trifluoroacetic acid, suitable for HPLC

574724

Sigma-Aldrich

Acetonitrile solution, contains 0.05 % (v/v) trifluoroacetic acid

37771

Sigma-Aldrich

Activated Charcoal Norit^®, Norit^® GAC 1240W, from coal, for potable water processing, steam activated, granular

576956

Sigma-Aldrich

Acetonitrile solution, contains 0.1 % (v/v) formic acid, suitable for HPLC

295477

Sigma-Aldrich

Methane, ≥99.0%

463035

Sigma-Aldrich

Methane, electronic grade, ≥99.998%

685461

Sigma-Aldrich

Acetonitrile solution, contains 10.0% acetone, 40.0% 2-propanol, 0.05% formic acid

699632

Sigma-Aldrich

Carbon, mesoporous, nanopowder, <500 nm particle size (DLS), >99.95% trace metals basis

699624

Sigma-Aldrich

Carbon, mesoporous, nanopowder, graphitized, <500 nm particle size (DLS), >99.95% trace metals basis

699640

Sigma-Aldrich

Carbon, mesoporous, average pore diameter 100±10 Å (typical), >99.95% trace metals basis

679186

Sigma-Aldrich

Acetonitrile solution, contains 0.05 % (w/v) ammonium formate, 0.1 % (v/v) formic acid, 5 % (v/v) water, suitable for HPLC

702110

Sigma-Aldrich

Carbon, mesoporous, hydrophilic pore surface

702102

Sigma-Aldrich

Carbon, mesoporous

34442

Sigma-Aldrich

Acetonitrile, suitable for DNA synthesis, ≥99.9% (GC)

494445

Sigma-Aldrich

Acetonitrile, biotech. grade, ≥99.93%

360457

Sigma-Aldrich

Acetonitrile, ACS reagent, ≥99.5%

33019

Sigma-Aldrich

Acetonitrile, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.5% (GC)

719803

Sigma-Aldrich

Carbon nanofibers, graphitized, platelets(conical), >98% carbon basis, D × L 100 nm × 20-200 μm

719781

Sigma-Aldrich

Carbon nanofibers, graphitized (iron-free), composed of conical platelets, D × L 100 nm × 20-200 μm

719811

Sigma-Aldrich

Carbon nanofibers, pyrolitically stripped, platelets(conical), >98% carbon basis, D × L 100 nm × 20-200 μm

49085

Supelco

Atrazine, analytical standard

48187

Supelco

Atrazine solution, 1000 μg/mL in methyl tert-butyl ether, certified reference material

270717

Supelco

Acetonitrile, HPLC grade, ≥99.93%

437557

Sigma-Aldrich

Acetonitrile, ≥99.5%, ACS reagent