Unified Interior Regions

Region 4: Mississippi Basin

Regions L2 Landing Page Tabs

Filter Total Items: 4,342
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Year Published: 1963

Cedar River basin floods

No abstract available

Schwob, Harlan H.

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Year Published: 1963

A plane-type soil sampler

While studying the effects of pesticides on fish and their environment for the Bureau of Sport Fisheries and Wildlife, I have developed a soil sampler that will collect a thin uniform layer of sediment from pond and stream bottoms. As it is becoming increasingly important to analyze the residual deposits of pesticides in this shallow layer of soil...

Frey, Paul J.

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Year Published: 1963

Diffusion of herbicides through plastic film

Plastic film have been used by fishery workers as barriers to subdivide experimental ponds in order to assess the value of some chemical treatment, and as test vessels to contain dilute solutions or suspensions of toxic chemicals in experiments conducted to establish tolerance levels of these chemicals for fish.

Bridges, W.R.; Sanders, Herman O.

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Year Published: 1963

Persistence of DDT and its metabolites in a farm pond

A farm pond near Morrison, Colorado, was treated with 0.02 p.p.m. of DDT in June 1961. The persistence and distribution of the insecticide in materials sampled from the aquatic environment were studied until November 1962. Detectable amounts of DDT were not found in the water after 3 weeks. Residues in the mud had declined within 8 weeks after the...

Bridges, W.R.; Kallman, B.J.; Andrews, A.K.

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Year Published: 1963

Polyethylene as a source of artifacts in the paper chromatography of chlorinated hydrocarbon insecticides

The introduction of artifacts from vessels, materials, and chemicals is a serious problem in the study of pesticide residues. It is therefore of interest to record findings that polyethylene wash bottles contain substances soluble in organic solvents and reactive with the silver nitrate chromogenic spray commonly employed in the paper...

Van Valin, C.C.; Kallman, B.J.; O'Donnell, J.J

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Year Published: 1962

Photometric microdetermination of malathion

Carboxylic esters and lactones react with alkaline hydroxylamine to yield hydroxamates; these in acidic solution form colored iron(III) complexes. A photometric determination of such esters and lactones is thus permitted and has been extensively applied ( I-6). Hestrin ( 3) utilized this method for the microdetermination of acetylcholine and his...

Kallman, B.J.

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Year Published: 1962

Distribution and detoxication of toxaphene in Clayton Lake, New Mexico

The fate of toxaphene, applied in three treatments at a total calculated concentration of 0.05 p.p.m. to Clayton Lake, New Mexico, was followed over a 1.5-year period. A detailed description of the chromatographic method of analysis is given. Water concentrations of toxaphene were higher in leeshore samples than in windward samples for 2 weeks...

Kallman, Burton J.; Cope, Oliver B.; Navarre, Richard J.

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Year Published: 1961

Surface water records of Iowa

No abstract available.

Surface water records of Iowa; 1961; USGS Unnumbered Series; Geological Survey (U.S.)

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Year Published: 1961

Geology and ground-water resources of Clayton County, Iowa

Clayton County includes 784 square miles in northeastern Iowa and in 1960 had a population of 21, 962.  For the most part, the county is a dissected upland that is drained mainly by the southeastward flowing Turkey River and its principal tributary, the Volga River.  The Turkey River empties into the Mississippi River, which flows...

Steinhilber, W.L.; Van Eck, O. J.; Feulner, A.J.

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Year Published: 1961

Standards for reporting fish toxicity tests

The growing impetus of studies on fish and pesticides focuses attention on the need for standardized reporting procedures. Good methods have been developed for laboratory and field procedures in testing programs and in statistical features of assay experiments; and improvements are being made on methods of collecting and preserving fish,...

Cope, O.B.

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Year Published: 1960

Collection and preservation of fish and other materials exposed to pesticides

The effects of pesticides on fish have become improtant to fish conservation since World War II, when DDT first came into common use. With the development of other potent insecticides and the increasing use of massive dosages in more recent years, the threat to fish and fish foods has increased. Fishery biologists have conducted some studies on...

Cope, Oliver B.