A Search for Some Nitro-Oleflns in Polluted Air

An electron capture chromatographic method of detecting nitro-ethylene and 1-nitro-lpropene was developed and applied to ambient air samples, photolyzed propene/nitrogen dioxide mixtures and auto exhaust. No trace of either compound was found in ambient air or in the photolyzed mixtures. The detection limit was estimated to be 1 ppb. A single sample of auto exhaust showed several small peaks which, if attributed to nitroolefin, would amount to insignificant traces     

Metabolism of 2‐chloro‐N‐isopropylacetanilide (propachlor) in the sheep and milk goat

Abstract

Sheep metabolized a single oral dose of 2‐chloro‐N‐isopro‐pylacetanilide (propachlor) to four urinary metabolites. These were 2‐(S‐cysteinyl)‐N‐isopropylacetanilide and 2‐[S‐(N‐acetyl) cysteinyl]‐N‐isopropylacetanilide and the glucuronide conjugates of 4'‐hydroxy‐N‐isopropyl‐2‐methylsulfonylacetanilide and N‐(1‐hydroxyisopropyl)‐2‐methylsulfonylacetanilide. Residues (ppb equivalents of propachlor) from [¹⁴C]‐propachlor in the milk from a goat given daily oral doses (1.3 mg of propachlor three times daily for 15 days) plateaued at about 2 to 4 ppb equivalents of propachlor. In goat tissue, residues ranged from 1 ppb (fat) to 20 ppb (liver). Fecal and tissue metabolites were not identified.     

Rat urinary metabolites from O,O‐diethyl‐O‐(3, 5, 6‐trichloro‐2‐pyridyl) phosphorothioate

Abstract

Rats metabolized single oral doses of O,O‐diethy1–0‐(3,5,6‐trichloro‐2‐pyridyl‐2,6‐¹⁴C) phosphorothioate to at least six radiolabeled urinary metabolites. The urine contained about 90 percent of the dose. Three of these metabolites were identified as the glucuronide of 3,5,6‐trichloro‐2‐pyridinol (80% the urinary ^l4C), a glycoside of 3,5,6‐trichloro‐2‐pyridinol (4%), and 3,5,6‐trichloro‐2‐pyridinol (12%).     

CORRELATION OF COPROSTANOL TO ORGANIC CONTAMINANTS IN COASTAL AND ESTUARINE SEDIMENTS OF THE U.S.1

ABSTRACT: Results from the National Status and Trends Program, a nationwide effort to evaluate U.S. coastal and estuarine environmental quality, are analyzed to provide information about regional sources of organic contaminants in the benthic environment. Spearman's rank correlation procedure is applied to measurements of coprostanol, a chemical tracer of sewage, and three classes of organic compounds in sediments. The results suggest that discharges from publicly owned treatment works are responsible for concentrations of the organic compounds encountered in the northeastern coastal region, while other sources may predominate in the other regions of the country.     

Environmental monitoring for PCB and heavy metals in the vicinity of a chemical waste disposal facility - I

As part of a long-term environmental monitoring programme, PCBs and heavy metals have been determined on a monthly basis in soil and foliage samples collected from 13 sites, generally located within a 2 km radius of a hazardous and toxic waste disposal facility that has been operating for over ten years. Data are presented for a seven month period, from June 1984 to December 1984, and the results compared with normal worldwide background values given in the literature, and with some isolated U.K. samples. The comparison showed that no elevations indicative of industrial pollution had occurred. A statistical evaluation of the data indicated that there was no correlation suggestive of an airborne mode of transportation from a point source, with respect to distance from the plant or to the predominant wind vectors. The results confirm that the waste disposal facility has had no detrimental effect on the environment.     

Intensity of territorial defense in red squirrels: an experimental test of the asymmetric war of attrition

Summary Red squirrels defend exclusive, individual territories year round, 20% to 50% of females do not breed in any given year, and breeding females raise juveniles on their territories. Breeding is asynchronous, and the offspring of early-breeding females are more likely to hold an independently won territory than are late-born offspring. Based on the asymmetric war of attrition, we made the following predictions: (1) squirrels would respond more intensely to the calls of unfamiliar individuals than to the calls of neighbors; (2) breeding females would respond more intensely to unknown calls than would non-breeding females or males; (3) early-breeding females would respond more intensely than would late-breeding females to unknown calls; and (4) all classes of squirrels would respond similarly to the calls of neighbors. Playback experiments supported the predictions. Alternative hypotheses of kin selection, risk of infanticide, and seasonal difference in intruder pressure could not explain the results.     

Rat urinary metabolites from O,O-diethyl-O-(3,5,6-trichloro-2-pyridyl) phosphorothioate.

Rats metabolized single oral doses of O,O-diethyl-O(3,5,6-trichloro-2-pyridyl-2,6-14C) phosphorothioate to at least six radiolabeled urinary metabolites. The urine contained about 90 percent of the dose. Three of these metabolites were identified as the glucuronide of 3,5,6-trichloro-2-pyridinol (80% the urinary 14C), a glycoside of 3,5,6-trichloro-2-pyridinol (4%), and 3,5,6-trichloro-2-pyridinol (12%).     

Rat intestinal metabolism of crufomate (4-tert-butyl-2-chlorophenyl methyl methylphosphoramidate).

Everted sacs of rat small intestine metabolized crufomate (4-tert-butyl-2-chlorophenyl methyl methylphosphoramidate) under in vitro conditions to form six 14C-labeled metabolites in quantities sufficient for isolation and identification. These metabolites were 4-tert-butyl-2-chlorophenyl methyl phosphoramidate (25%), 2-chloro-4(2-hydroxy-1,1-dimethylethyl)phenyl methyl methylphosphoramidate (19%), 2-[3-chloro-4-[[(methoxy) (methyl-amino)phosphoinyl]oxy]phenyl]-2-methylpropionic acid (2%), 4-tert-butyl-2-chlorophenol (0.8%) and its glucuronide (6%), and the aromatic glucuronide of 2-chloro-4(2-hydroxy-1,1-dimethylethyl)phenol (1%). These intestinal metabolites may represent precursory stages in the overall metabolism of crufomate.     

Water and Sediment Quality in the Clinch River,Virginia and Tennessee,USA, over Nearly Five Decades

The Clinch River, in eastern United States, supports a diverse freshwater fauna including endangered mussels. Although mussel populations are stable in the Clinch's northeastern Tennessee segment, long‐term declines have been documented upstream in Virginia. We analyzed water and sediment quality data collected by government agencies from the 1960s through 2013 in an effort to inform current management. The river was divided into sections considering data availability and major tributaries. We tested for spatial differences among river sections and for temporal trends, and compared measured values to potentially protective levels if available. Ammonia concentrations approaching and exceeding protective levels were recorded, most often during the 1970s and 1980s in upstream sections. Sediment metals occurred at levels potentially causing biological effects, mainly during the 1980s and 1990s. In the 2000s, water‐column metals have been well below protective levels for general aquatic life. Dissolved solids (DS) increased in most river sections over the study period but mussel‐specific protective levels are not known. Analysis of water pH, total N, and total P did not generate conservation concern. Enhanced monitoring for sediment metals, water‐column metals, and ionic composition of DS; closer alignment of agency water monitoring practices in the two states; and research to determine biological effects of DS at current and anticipated levels can aid future conservation management.