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71.
针对燃煤锅炉燃烧产生的低温烟气仍具有一定温度的现象,提出通过增设超导热管空气预热器对这部分低温烟气余热加以回收的设想,对锅炉送风进行预热,探讨烟气余热利用可达到的送风温度、节能效果及可能产生的经济效益。 相似文献
72.
乙虫腈是在我国登记并广泛使用的氟虫腈替代药剂,其商品化制剂为拜尔公司研发的100 g·L~(-1)悬浮剂,目前关于乙虫腈制剂对非靶标生物的毒性研究少有报道。为探究乙虫腈制剂对蜜蜂的毒性作用,采用人工饲喂法分别测定了100 g·L~(-1)乙虫腈悬浮剂对新出房意大利蜜蜂的48 h急性和14 d慢性毒性作用。结果显示:乙虫腈悬浮剂对新出房意大利蜜蜂的48 hLC_(50)值为0.21 mg·L~(-1)(95%置信限0.16~0.26 mg·L~(-1)),相应的48 h-LD50为5.0×10~(-3)μg a.i.·蜂~(-1)(95%置信限1.0×10~(-3)~1.0×10~(-2)μg a.i.·蜂~(-1));在亚致死剂量下,蜜蜂死亡数量随暴露时间的延长而增多,且100 g·L~(-1)乙虫腈悬浮剂会引起蜜蜂显著的氧化应激反应,诱导抗氧化酶SOD和CAT活力、脂质过氧化产物MDA含量、解毒酶GST活力和底物GSH含量的显著变化。研究表明,乙虫腈悬浮剂对意大利蜜蜂毒性较高,即使在亚致死剂量下亦存在显著的影响。田间施用应防止药剂的漂移污染,并避免在作物花期施用;新出房意大利蜜蜂对药剂敏感,未来可探索其作为风险指示生物应用的可能。 相似文献
73.
Shen Xiaoxue Li Ruili Chai Minwei Cheng Shanshan Niu Zhiyuan Qiu Guo Yu 《Environmental geochemistry and health》2019,41(1):135-148
Environmental Geochemistry and Health - Heavy metals are considered important environmental contaminants, and their mixture toxicity on plants has complex mutual interactions. The interactive... 相似文献
74.
Environmental Geochemistry and Health - To investigate the distribution of mercury (Hg) in Futian mangrove wetland, surface sediments from land to sea were collected, including Kandelia obovata,... 相似文献
75.
Yuling Zhang Hanxiao Wei Yijian Jiang Shaoxin Kang Zhiguang Hu Jilong Wang 《Journal of Polymers and the Environment》2018,26(1):116-121
Poly(aspartic acid-itaconic acid) copolymers (PAI) is a new scale inhibitor for water treatment. Thus, it is necessary to investigate its biodegradability. The biodegradability of PAI was investigated through CO2 evolution tests under different conditions based on determination of carbon dioxide production. The investigation results showed that the degradation rate of PAI on day 10 and day 28 were respectively 38.7 and 79.5%, indicating that PAI was one kind of easily biodegradable scale inhibitors. With the increase in the content of itaconic acid in copolymerization process, the biodegradability of PAI was significantly reduced. In addition, the high biodegradability might be attributed to the existence of C–N bone-structure and more –COO–. Finally, Cu2+ could decrease the degradation percentage and the enzyme inhibition effect of Cu2+ was not the linear effect, but the “low-dosage effect”. 相似文献
76.
77.
Dai Shijin Zheng Yilin Zhao Youcai Li Qiang Niu Dongjie 《Environmental science and pollution research international》2019,26(10):9480-9489
Environmental Science and Pollution Research - Chlorine-containing organic waste (COWs) is a big threat for the waste incineration because of the dioxin generation and equipment corrosion.... 相似文献
78.
Y. Chen H. R. Jia S. Niu X. Zhang H. L. Wang Y. Z. Ye Q. S. Chen Z. L. Yuan 《Russian Journal of Ecology》2018,49(1):40-46
Species turnover patterns can be inconsistent due to differences in the dispersal ability of different growth forms. Here, species of trees, shrubs, herbs, and bryophytes in the Xiaoqinling National Nature Reserve in China were analyzed to determine patterns of species turnover along an elevation and spatial gradient. Variance partitioning was used to assess the relative contribution of topographic heterogeneity and dispersal limitation to species turnover. Our results suggest that the effect of dispersal limitation is more important than topographic heterogeneity on species turnover in temperate mountane ecosystems in the study area. Dispersal limitation has a greater effect on trees species turnover than on shrubs, herbs or bryophytes species turnover. 相似文献
79.
蚯蚓对垃圾与底泥中镉的富集现象 总被引:1,自引:0,他引:1
通过蚯蚓处理垃圾及纳污河流底泥实验研究发现蚯蚓可选择吸收并富集垃圾及底泥中的镉,但对其他重金属元素铅、铜、锌等并无此种富集吸收现象。 相似文献
80.
A major, often unrecognized variable regulating plant growth in semi-closed environment is air contaminant. The vapor of propylene glycol (PG), which was used as coolant in growth chambers, has been found to be toxic to corn (Zea mays L.) and soybean (Glycine max L.) plants. PG solution leaked from a valve packing system and volatilized to vapor, which was trapped in a semi-closed growth chamber. Symptoms of leaf edge chlorosis, later developing into necrosis, were observed on the third day of emergence or on the third day after moving healthy plants into the chamber. For young soybean plants, symptoms were slightly different from those observed in corn plants; the chlorosis symptoms were not uniformly distributed on all leaves. Some soybean leaves curled up and others had white spots. This problem was identified by using a portable photoionization detector to obtain instantaneous readings of total volatile organic compound concentrations inside the chambers. The presence of PG in selected chambers was verified using sample collection with solid phase microextraction (SPME) followed by analysis with multi-dimensional gas chromatography mass spectrometry (MD-GC-MS). This information is pertinent to researchers who use controlled environment to grow plants. 相似文献