Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 5 pdf

... concentrations of atrazine, cyanazine, and alachlor in rain peaked during the spring herbicide application season in Minnesota. Glotfelty and others (1990c), and Wu (1981) found the same spring-summer behavior ... Goolsby and others (1994) found that triazine and acetanilide herbicide concentrations and detection frequency in rain were highest in the intense corn-...

Ngày tải lên: 12/08/2014, 05:21

... 19 85; Ross and Sava, 1986; Oudiz and Klein, 1988; Seiber and others, 1989; Ross and others, 1990; Fleck and others, 1991), and precipitation (Wu, 1981; Shulters and others, 1987; Glotfelty and ... Sampling Date 196 6-6 8 197 0-7 5 July-Nov 1974 Aug 1974 Aug 19 75 Location(s) Sites in Saskatchewan, Canada: a Aberdeen (1970) b Regina (196 6-7 5) c...

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... reviews and analyses of our current knowledge and understanding of pesticides in the water resources of the United States and of the principal factors that influence contamination and transport. The ... support in conducting literature searches, obtaining many of the references, and assisting in many other ways during the research and writing phase of this...

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... usually in the early mornings and evenings, and with rain and irrigation (Cliath and others, 1980; Hollingsworth, 1980; Glotfelty and others, 1984; Grover and others, 19 85; Majewski and others, ... Majewski and others, 19 95 Majewski and others, 19 95 Seiber and others, 1986 Soderquist and others, 1977 Majewski and others, 1990 Glotfelty and others, 19...

Ngày tải lên: 12/08/2014, 05:21

... alachlor, atrazine, and 2,4-D. Cyanazine, 2,4-D, and 2,4 , 5- T exceeded, and atrazine has been detected in several samples near the long-term exposure limit for children. In general, the very high ... ground- water systems (the ancient earthblock and the scarplands) and found that only one percent of the a- and y-HCH percolated into the shallow ground water. H...

Ngày tải lên: 12/08/2014, 05:21

... (Crockett and others, 1974), in 19 85 in California (Mischke and others, 19 85) , and during 1988–1989 in Washington (Rinella and others, 1993). In the California study (Mischke and others, 19 85) , only fields ... about 50 percent for dieldrin (Reinert and others, 1974a); 27–62 percent for DDT (Jarvinen and others, 1977); and 50 –70 percent for DDE (Hamelink and...

Ngày tải lên: 11/08/2014, 06:23

... nd–366 50 20 Mirex nr, 0.01–100 nd–1,834 85 13 nr, 0.01 50 nd–310 64 9 Nonachlor, cis - nr, 0 .5 100 nd 5. 5 22 9 nr, 0 .5 100 nd 5. 5 22 9 Nonachlor, trans - nr, 0 .5 100 nd–16 21 10 nr, 0 .5 100 ... contaminants in the hydrologic system. Clearly, the monitoring studies reviewed (Tables 2.1 and 2.2) indicate that many pesticides are frequently found in these med...

Ngày tải lên: 11/08/2014, 06:23

... monitoring over the last several decades. Studies in the late 1 950 's and the 1960's focused on the OCs and a few phenoxy acid herbicides (2,4-D, 2,4 , 5- T, and silvex [2,4 , 5- TP]) and ... and can bioaccumulate in fish and other organisms. Finally, they continue to be used in other parts of the world and have the potential for long-range at...

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... Waters 2 25 inputs during base flow in 1989 and 1990, respectively, with the remainder coming from ground water (Squillace and others, 1996). They further state that the atrazine entering the river ... only once or twice in the 25 to 50 years between planting and harvesting. Minor uses of herbicides include manipulation of wildlife habitat and maintenance of rights-...

Ngày tải lên: 12/08/2014, 05:21

... regulatory, and industrial-would agree that models provide a valuable tool in understanding and predicting the behavior and fate of pesticides in the environment in general, and in surface waters in ... 0 - Maximum concentration -9 5th percentile -7 5th percentile - -Median -2 5th percentile I -5 th percentile i -reporting limit or minimum...

Ngày tải lên: 12/08/2014, 05:21