The extraction of zinc by di-(2-ethylhexyl)-dithiophosphoric acid(D2EHDTPA)-trioctylamine(TOA) was investigated.Conductance titration and interfacial pressure measurement showed that when D2EHDTPA and TOA were mixed t...The extraction of zinc by di-(2-ethylhexyl)-dithiophosphoric acid(D2EHDTPA)-trioctylamine(TOA) was investigated.Conductance titration and interfacial pressure measurement showed that when D2EHDTPA and TOA were mixed they reacted and formed an electrolyte of ionic pairs.The extraction of zinc by the electrolyte was of antisynergistic nature,and the reaction was Zn2＋＋ 2BHA(O)→ Zn-(O)＋ 2B(O)＋ 2H＋ (subscript (o) stand for“ oil phase” ).The zinc extraction was an endothermic reaction ,the heat of reaction was 130.1 kJ· mol－ 1.Some phenomena of interface concerned were also discussed.展开更多
Seven organophosphoric acid triesters （OPEs） and eight polycyclic aromatic hydrocarbons （PAHs） in black cicadas were measured to determine the concentration levels and to investigate how the cicadas are affected b...Seven organophosphoric acid triesters （OPEs） and eight polycyclic aromatic hydrocarbons （PAHs） in black cicadas were measured to determine the concentration levels and to investigate how the cicadas are affected by soil contamination. Adult cicadas, nymphal exoskeletons, and soils were sampled in Higashi Osaka, Japan. Four OPEs and six PAHs were detected in the adult cicadas. The total concentrations of OPEs and PAHs ranged from 27.2 ng/g to 824 ng/g and from 4.30 ng/g to 270 ng/g, respectively. Four OPEs and five PAHs were detected in the nymphal exoskeletons. The total concentrations of OPEs and PAHs ranged from 184 ng/g to 1830 ng/g and from 40.3 ng/g to 970 ng/g, respectively. In the soils, three OPEs and six PAHs were detected at the same concentration levels as those detected in the adult cicadas. Significant correlations were observed in the micropollutant concentrations between soils and adult cicadas, and between soils and nymphal exoskeletons. This trend indicates that black cicadas accumulate OPEs and PAHs from contaminated soils.展开更多
文摘The extraction of zinc by di-(2-ethylhexyl)-dithiophosphoric acid(D2EHDTPA)-trioctylamine(TOA) was investigated.Conductance titration and interfacial pressure measurement showed that when D2EHDTPA and TOA were mixed they reacted and formed an electrolyte of ionic pairs.The extraction of zinc by the electrolyte was of antisynergistic nature,and the reaction was Zn2＋＋ 2BHA(O)→ Zn-(O)＋ 2B(O)＋ 2H＋ (subscript (o) stand for“ oil phase” ).The zinc extraction was an endothermic reaction ,the heat of reaction was 130.1 kJ· mol－ 1.Some phenomena of interface concerned were also discussed.
文摘Seven organophosphoric acid triesters （OPEs） and eight polycyclic aromatic hydrocarbons （PAHs） in black cicadas were measured to determine the concentration levels and to investigate how the cicadas are affected by soil contamination. Adult cicadas, nymphal exoskeletons, and soils were sampled in Higashi Osaka, Japan. Four OPEs and six PAHs were detected in the adult cicadas. The total concentrations of OPEs and PAHs ranged from 27.2 ng/g to 824 ng/g and from 4.30 ng/g to 270 ng/g, respectively. Four OPEs and five PAHs were detected in the nymphal exoskeletons. The total concentrations of OPEs and PAHs ranged from 184 ng/g to 1830 ng/g and from 40.3 ng/g to 970 ng/g, respectively. In the soils, three OPEs and six PAHs were detected at the same concentration levels as those detected in the adult cicadas. Significant correlations were observed in the micropollutant concentrations between soils and adult cicadas, and between soils and nymphal exoskeletons. This trend indicates that black cicadas accumulate OPEs and PAHs from contaminated soils.
