摘要:

This study evaluated the nephrotoxic effects of sodium chlorite when administered in the drinking water of male Sprague‐Dawley rats. Sodium chlorite was administered for periods of 30, 90, and 180 days and at concentrations of 31.2, 125, and 500 ppm (along with appropriate negative and positive controls). Examination of sections by light microscope revealed no abnormalities in the kidneys of the rats in the chlorite exposure groups. Water consumption, mortality, kidney weight, body weight change, and percent kidney to body weight ratio showed no statistically significant relationship to chlorite ion concentration, although an association was observed between the latter two parameters and sodium concentration of treatment water.

ISSN:0360-1226    

DOI:10.1080/10934528409375185

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Effect of inhalation of coal fly ash for 6 hrs daily for fifteen days has been studied on the distribution of metal ions of fly ash in lung, liver, kidney, heart, small Intestine and serum of rats 1, 7, 15 and 30 days after the last inhalation exposure. The distribution of Na, K, Fe, Ca, Mg, Pb, Zn, Cu, Co, Mi, Cr, Mn and Sr was studied. The results shoved a profound increase in the concentration of the above metals in all the tissues and serum of rats inhalting fly ash. The increased levels of the metals were highest one day after the last exposure and at later periods their concentration declined which varied from metal to metal and from organ to organ. Even 30 days after the exposure the retention of some elements in organs and serum of experimental group was substantially high as compared to unexposed rats.

ISSN:0360-1226    

DOI:10.1080/10934528409375186

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Microorganisms present in water samples obtained from a small tributary to the Gunpowder River in Maryland degraded 2,4,6‐trichloroaniline following a prolonged acclimation period. Creek water sediments, but not the co‐substrate aniline, reduced the lag time prior to degradation. The microorganisms in the samples could be enriched to grow on 2,4,6‐trichloroaniline as indicated by increases in carbon dioxide, chloride, and adenosine triphosphate and by slight biomass increases accompanying the degradation of the compound. Uptake bf 2,4,6‐trichloroaniline by the enrichment population was as rapid as that of the original sample population but was without an apparent lag. Similar enrichment cultures could not be developed from five other sites.

ISSN:0360-1226    

DOI:10.1080/10934528409375187

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Composting organic wastes before applying them to the soil helps to produce a relatively homogeneous, odor‐free, easy‐to‐handle material. Also, it may destroy or deactivate weed seeds and many plant and animal pathogens. Decomposition of residues before they are added to the soil will presumably have different effects than allowing them to decompose in the soil, but effects on soil fertility and microbiology have been little studied. This paper describes research on the influence of composting on soil nitrogen availability, cation exchange capacity, organic matter content, and structure.

ISSN:0360-1226    

DOI:10.1080/10934528409375188

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Metal chelate compounds of the type M(o‐OC6H4CH=NC4H9)2(M = Ni, Cu, Zn, etc.) participate in the dehalogenation of chloroform in the presence of ethylene diamine or tetramethyienediamine under homogeneous conditions and at elevated temperatures. Both an amine‐assisted and a metal‐assisted pathway are recognized on the basis of rate expression. In contrast, only an amine‐assisted pathway was observed for dichloromethane. Under non‐homogeneous conditions, however, i.e., using pure solvent, dehalogenation led to [M(diamine)n]Cl2. Te importance of solubility as a driving force is considered as are the implications in the design of agents that will effect dehalogenation of chlorinated methanes.

ISSN:0360-1226    

DOI:10.1080/10934528409375189

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

The response of the submersed plantHydrilla verticillata(Royle) in well water solutions of the inert dye Aquashade®was measured. Growth rate was measured as increase in wet weight following two weeks in a phytotron room at 125 μE/m2/sec. It was found that plants treated with 3 ppm Aquashade®grew 30.8% ± 9.9% compared to plants without Aquashade®which grew 62.0% ± 18%. The two mechanisms of action which were investigated were shading and photodynamic action. A plot of percent growth versus concentration of Aquashade®showed an exponential decrease owing to shading. Available data indicate that the effect of shading is the major, if not exclusive, mode of action affecting the growth of hydrilla.

ISSN:0360-1226    

DOI:10.1080/10934528409375190

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Five electrode systems and procedures that are widely marketed for routine determination of total residual chlorine have been evaluated in a variety of water matrices. The performance, in terms of accuracy, precision, and sensitivity, has been determined for the Orion 97–70 Residual Chlorine Electrode, Chlortect Monitor, Lazar 136A Chlorine Electrode, the forward amperometric titration method, and the back amperometric titration method. Response times for the former too systems were comparable and ranged from 20–100 seconds for chlorine concentrations ranging from 0.3–7 ppm in all water matrices. The Lazar electrode had considerably longer response times. The Chlortect Monitor and the forward amperometric titration method gave the highest sensitivity, with values of + 0.005 and .01 ppm, respectively, at the 1 ppm level. However, the Lazar Electrode could not be completely evaluated because of inconsistencies in the marketed procedures.

ISSN:0360-1226    

DOI:10.1080/10934528409375191

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

ISSN:0360-1226    

DOI:10.1080/10934528409375184

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor