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J.B. Sills

Publications and source records attributed to J.B. Sills.

14 recordsLinked to original sources
USGS2020

Gas-liquid chromatographic determination of 3-trifluoromethyl-4-nitrophenol residues in fish

A procedure for the determination of 3-trifluormethyl-4-nitrophenol (TFM) in fish tissues is described. Homogenized tissues are extracted with hexane-ethyl ether; the extract is cleaned up by partitioning the TFM from the extracting solvent into 0.1 N NaOH, acidifying the aqueous solution, and partitioning again with hexaneethyl ether. The TFM is methylated with diazomethane and analyzed by gas-liquid chromatography, using electron capture detection. Recoveries ranged from 75 to 100% from fish muscles that were spiked with 0.01—2.00 μg TFM/g.

Journal of the Association of Official Analytical ↗
USGS2020

GLC determination of quinaldine residue in fish

A procedure for the determination of quinaldine residue in various fish tissues is described. Homogenized tissues are extracted with hexane-ethyl ether, the extracts are concentrated by partitioning through 0.1N sulfuric acid, and the residues are measured by alkali flame ionization gas chromatography. Muscle tissues containing from 0.01 to 10.0 ppm quinaldine were successfully analyzed with recoveries from 75 to 100%.

Journal of the Association of Official Analytical ↗
USGS2020

UV identification and quantitative measurement of quinaldine residues in fish

A method for the confirmatory analysis of quinaldine residue in fish is described. The method utilizes the same extraction and cleanup procedure as the GLC method reported previously. The lower limit of sensitivity for quinaldine residue in fish muscle is 0.01 ppm. Identification is accomplished by comparing the UV spectra of the sample and a standard solution of quinaldine.

Journal of the Association of Official Analytical ↗
USGS2020

Gas-liquid chromatographic determination of Bayer 73 in fish, aquatic invertebrates, mud, and water

A gas-liquid chromatographic (GLC) method is described for determining residues of Bayer 73 (2-aminoethanol salt of 2’,5-dichloro-4’-nitrosalicylanilide) in fish muscle, aquatic invertebrates, mud, and water by analyzing for 2-chloro-4-nitroaniline (CNA), a hydrolysis product of Bayer 73. Bayer 73 residues are extracted from fish muscle tissue, invertebrates, and mud with acetone-formic acid (98+2), and partitioned from water samples with chloroform. After sample cleanup by solvent and acid-base partitioning, the concentrated extract is hydrolyzed with 2 N NaOH and H 2 O 2 for 10 min at 95°C. The CNA is then partitioned into hexane-ethyl ether (7+3) and determined by electron capture GLC. Average recoveries were 88% for fish, 82% for invertebrates, 82% for mud, and 98% for water at 3 or more fortification levels.

Journal of the Association of Official Analytical ↗
USGS2002

Residues of isobornyl thiocyanoacetate (Thanite) and a metabolite in fish and treated ponds

Isobornyl thiocyanoacetate (Thanite) is an insecticide that induces a surfacing response in fish and therefore has been considered to have potential as a fish collection agent. Analyses for residues of Thanite in carp (Cyprinus carpio) and largemouth bass (Micropterus salmoides) exposed to chemical yielded only a trace of the parent compound. A metabolite, isobornyl a-(methylthio)acetate, was isolated and indentified by GC-MS,and a reference standard for the metabolite was synthesized. Residues of the metabolite were present in largemouth bass muscle tissue within 1 h after exposure to Thanite. The metabolite was also observed in the muscle, blood plasma, and bile of carp. Residues of the metaboliteare rapidly elimanated after the fish are transferred to Thanite-free water. Residues of Thanite in water, algae, and from soil from ponds treated with Thanite declined to undetectable levels within 28 days after treatment.

Journal of Agricultural and Food Chemistry↗
USGS1971

The influence of pH on the efficacy and residues of quinaldine

Quinaldine, an anesthetic for fish, loses its effectiveness in solutions having pH values less than 6. Measured quantities of un‐ionized quinaldine in solution compared favorably with calculated values at selected pHˈs. Quinaldine residues in largemouth bass (Micropterus salmoides) anesthetized at various pHˈs verify that only the un‐ionized portion in solution enters the fish. Quinaldine residues in fish and un‐ionized quinaldine in solution were measured by gas chromatography.

Transactions of the American Fisheries Society↗
USGS1969

Chlorinated hydrocarbons in the young of Lake Michigan coho salmon

Three thousand eyed coho salmon (Oncorhynchus kisutch) eggs from Lake Michigan stock were sent by the Department of Natural Resources to the Fish Control Laboratory, La Crosse, Wis., on January 15, 1969, for use in evaluating candidate fish-cnotrol chemicals.

Progressive Fish-Culturist↗