Methane emissions responding to Azolla inoculation combined with midseason aeration and N fertilization in a double-rice cropping system

Environmental Science and Pollution Research - Methane (CH4) is an important greenhouse gas (GHG), and paddy fields are major sources of CH4 emissions. This pot experiment was conducted to...     

Comparison of PM2.5 emission rates and source profiles for traditional Chinese cooking styles

Environmental Science and Pollution Research - The number of restaurants is increasing rapidly in recent years, especially in urban cities with dense populations. Particulate matter emitted from...     

Preparation of controlled low-strength materials from alkali-excited red mud-slag-iron tailings sand and a study of the reaction mechanism

Environmental Science and Pollution Research - To address the low utilization of fines in iron tailings sand (IOTs), a controlled low-strength material (CLSM) was prepared from a combination of...     

Effects of H19/SAHH/DNMT1 on the oxidative DNA damage related to benzo[a]pyrene exposure

Environmental Science and Pollution Research - The mechanisms that long noncoding RNA (lncRNA) H19 binding to S-adenosylhomocysteine hydrolase (SAHH) interacted with DNA methyltransferase 1 (DNMT1)...     

输油站的安全管理与消防

从输油站安全管理的方针、目的、管理对象及内容等方面进行分析和阐述,提出了预防输油站事故发生的技术措施和管理措施,可为输油站安全运营提供参考。     

Enantioselective fate of mandipropamid in grape and during processing of grape wine

Environmental Science and Pollution Research - Enantioselective monitoring of chiral fungicide mandipropamid enantiomers were carried out in grapes and wine-making process. The enantiomers of...     

Excretion stereoselectivity of triticonazole in rat urine and faeces

Abstract

The purpose of this study was to study the excretion stereoselectivity of triticonazole enantiomers in rat urine and faeces. Six male Sprague-Dawley (SD) rats were administrated 50?mg/kg rac-triticonazole. Rats urine and faeces were separately and quantitatively collected at the following intervals: 0–3, 3–6, 6–9, 9–12, 12–24, 24–36 and 36–48?h. The faeces samples were homogenized in an aqueous solution containing 0.2% DMSO at the ratio of 1?g: 40?mL. An aliquot of 100?μL rats urine or faeces homogenate was spiked and mixed with 6.0?μL of 1.00?μg/mL flusilazole as an internal standard. The triticonazole enantiomers in urine and faeces were determined by using an HPLC/MS–MS after samples preparation. The excreted amounts of enantiomers in the urine showed a significant difference (P?<?0.05) except for 3–6?h. The cumulative excretion rate (Xu_0→24) in urine was 26.43?±?0.08% and 37.58?±?0.11% for R-(?)- and S-(+)-triticonazole, respectively, indicating high enantioselectivity (P?<?0.001). The cumulative excretion rate (Xu_0→72) in faeces was 6.93?±?0.03% and 6.77?±?0.03% for R-(?)- and S-(+)-triticonazole, respectively, without a difference. The results showed that the total cumulative percentage of triticonazole enantiomers accounted for in urine and faeces was 64.00?±?0.13% and 13.70?±?0.32%, the urinary excretion of R-(?)- and S-(+)-triticonazole were significantly different and S-(+)-triticonazole was preferentially excreted. However, the faecal excretion of the enantiomers showed no difference.     

Evaluating PM₂.₅ ionic components and source apportionment in Jinan, China from 2004 to 2008 using trajectory statistical methods

The mass concentrations and major chemical components of PM(2.5) in Jinan, Shandong Province, China from Dec. 2004 to Oct. 2008 were analyzed using backward trajectory cluster analysis in conjunction with the potential source contribution function (PSCF) model. The aim of this work was to study the inter-annual variations of mass concentrations and major chemical components of PM(2.5), evaluate the air mass flow patterns and identify the potential local and regional source areas that contributed to secondary sulfate and nitrate in PM(2.5) in Jinan. The annual mean concentrations of PM(2.5), sulfate and nitrate in 2004-2008 were almost the highest in the world. The most significant air parcels contributing to the highest mean concentrations of mass and secondary ions in PM(2.5) originated from the industrialized areas of Shandong Province. Clusters with a lower ratio of NO(3)(-)/SO(4)(2-) in PM(2.5) originated from the Yellow Sea, while a higher ratio was observed in the clusters passing through Beijing and Tianjin. PSCF modeling indicated that the provinces of Shandong, Henan, Jiangsu, Anhui and the Yellow Sea were the major potential source regions for sulfate, in agreement with the cluster analysis results. Regional and long-range transport of NH(4)NO(3) played an important role in the nitrate concentration of Jinan. By comparing the distributions of secondary sulfate and nitrate over three years, enhanced emission control management before and during the 29(th) Olympic Games led to a discernible decrease in source contributions from Beijing and its environs in 2007-2008.