摘要:

A simple box model for studying the influence of emissions changes and meteorological conditions on ozone production in urban areas is presented. Several calculation examples illustrate how the model can be used to investigate the interrelationships of the primary mechanisms which determine ozone concentration levels in urban areas.

ISSN:0360-1226    

DOI:10.1080/10934528309375108

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The analysis for total arsenic is no longer sufficient to describe this contaminant in aquatic environments. Arsenic can undergo extensive chemical and biochemical transformations in an aquatic system. Since each of the resulting arsenic compounds differ in their toxicity to humans, it is important to follow these transformations. Examining the transformations under various chemical and physical conditions will aid in predicting the ultimate fate of the arsenicals in a given aquatic environment. In order to follow the transformations, it is first necessary to identify and quantitate them. It is important that the speciation procedures should be simple and adaptable to analyzing many samples.

ISSN:0360-1226    

DOI:10.1080/10934528309375109

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The waters and bottom sediments in the watershed of Union Lake in southern New Jersey are highly contaminated with substantial quantities of arsenic. Total arsenic contents were as high as 2780. μg/l in the water phase, whereas 2290. μg/l was the highest observed in bottom sediments. Pore water from this bottom sediment was 12,500. μg/l. Arsenic contents in the bottom sediments were 4240 times those found in overlying waters. In sediments, the order of predominance of the four arsenic species was: As+5> As+3> MMAA > DMAA. In four of the sediments, the inorganic arsenate was 72.8, 81., 84., and 88% of the total arsenical species. In water, the order of predominance was MMAA > As+3, As+5> DMAA. Difficulties with the analytical procedure for separation of the four arsenical species are discussed.

ISSN:0360-1226    

DOI:10.1080/10934528309375110

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Delta‐9‐tetrahydrocannabinol (?9‐THC) either alone or in conjunction with known mutagens was investigated for either excitatory or inhibitory effects on the mutation rate ofSalmonella typhimuriumLT2 strains TA1538, TA1537, TA1535, TA100 and TA98 in the standard Salmonella/microsomal testing system.

ISSN:0360-1226    

DOI:10.1080/10934528309375111

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The EPS l‐AP‐74–1 method (equivalent of U.S. EPA method 5) modified by the addition of a fifth impinger containing the polymer adsorbent was used in stack sampling of an aluminum reduction plant. The cyclohexane soluble organics extracted from the fraction of nozzle and probe wash, particulates on filter, water in impingers and polymer adsorbent were analyzed using a gas chromatograph equipped with the SE‐54 fused silica capillary column and the flame ionization detector. The concentrations of vapor phase polycyclic aromatic hydrocarbons from fraction of water in impingers, XAD‐2 and Tenax GC were compared for evaluation of the relative efficiency of these three adsorption matrices.

ISSN:0360-1226    

DOI:10.1080/10934528309375112

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The changes of the Cu and Cd concentrations in the bodies of the Cu‐contaminated fish exposed for long periods to fresh water and EDTA were determined.

ISSN:0360-1226    

DOI:10.1080/10934528309375113

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Rubber septa were effective dispensers for the fall armyworm (FAW),Spodoptera frugiperda(J. E. Smith), sex attractant (Z)‐9‐dodecen‐l‐ol acetate (Z9–12:AC). Trap captures of FAW were related to Dose with the highest numbers of males being captured in sticky traps baited with 5 and 10 mg Z9–12:AC/septum; the 10‐mg dosage gave catches of males comparable to traps baited with virgin females for up to 2 weeks. The addition of 2% (Z)‐9‐tetradecen‐l‐ol acetate (Z9–14:AC) to septa treated with Z9–12:AC had no significant effect on catches of FAW at any of the dosage levels. (Z)‐ll‐Hexa‐decen‐l‐ol acetate was also tested as a potential sex attractant for the FAW.

ISSN:0360-1226    

DOI:10.1080/10934528309375114

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0360-1226    

DOI:10.1080/10934528309375107

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor