10 samples of sediments obtained from the South Mid-Atlantic Ridge were measured for the abundances and distributions of polycyclic aromatic compounds（PAHs）. The total concentrations of PAHs（∑PAHs） ranged from 2....10 samples of sediments obtained from the South Mid-Atlantic Ridge were measured for the abundances and distributions of polycyclic aromatic compounds（PAHs）. The total concentrations of PAHs（∑PAHs） ranged from 2.768 to 9.826 μg/g dry sediment. The ∑PAHs was higher in sample 22V-TVG10 and sample 26V-TVG05 which were close to hydrothermal fields, with the lowest value in sample 22V-TVG14 which was farthest from hydrothermal fields, suggesting a probable hydrothermal origin of ∑PAHs of samples. Approximately nine kinds of PAHs were identified, and low molecular mass tricyclic and tetracyclic aromatic compounds were predominant in the samples. The concentrations of fluoranthene which were typical as hydrothermal alteration compounds were the highest among PAHs with dry weight between 0.913–3.157 μg/g. The phenanthrene homologue was most abundant in the samples, and the ratios between parent phenanthrene and methylphenanthrene which probably reflected the degree of hydrothermal alteration ranged from 0.097 to 1.602. The sample 22V-TVG10 possessing a maximum ratio value showed the intense influence of the hydrothermal alteration on this sample, which might further imply that PAHs in sediments were mainly derived from the hydrothermal alteration.展开更多
The contents of polycyclic aromatic sulfur compounds (PASCs) in the Kupferschiefer varied from sample to sample. Twenty PASCs were determined in the Kupferschiefer from Poland and Germany. Gold enrichment was only obs...The contents of polycyclic aromatic sulfur compounds (PASCs) in the Kupferschiefer varied from sample to sample. Twenty PASCs were determined in the Kupferschiefer from Poland and Germany. Gold enrichment was only observed in samples with higher PASC contents. At the same time, all the samples with gold enrichment originated from areas close to the redox boundary (the front section of Rote Fule) that was formed by oxidizing brines in contact with the reducing Kupferschiefer. It is proposed that the gold-bearing solutions encountered PASCs in the Kupferschiefer. PASCs could easily displace chloride ions from aurous chloride complexes to form stable gold S-chelates. Subsequent oxidation of these gold organic compounds could destroy the organic components and lead to the formation of metallic gold.展开更多
A comprehensive summary for the study on the monitoring of potential carcinogenicpolycyclic aromatic compounds (PACs) in the emission of coal combustion is presented in this pa-per. Some PACs in the stack gases of coa...A comprehensive summary for the study on the monitoring of potential carcinogenicpolycyclic aromatic compounds (PACs) in the emission of coal combustion is presented in this pa-per. Some PACs in the stack gases of coal-fired boiler have been determined with a procedure whichconsists of isokinetic stack sampling, extraction, preseparation and some instrumental analysis stepssuch as gas chromatographylmass spectrometry (GC/MS), high performance liquid chromatographyfHPLC), room temperature phosphorimetry (RTP) and synchronous fluorescence spectroscopy (SFS)and so on. The results indicate that the air pollution of PACs in China are related closely to thecoal combustion.展开更多
Continental epithermal ore deposits are commonly associated with sedimentary organic matter,oils or solid bitumen.These organics embedded in mineral deposits can convey valuable information of the ore genesis.However,...Continental epithermal ore deposits are commonly associated with sedimentary organic matter,oils or solid bitumen.These organics embedded in mineral deposits can convey valuable information of the ore genesis.However,the extent to which the formation of ore minerals was recorded by organic compounds remains largely unknown,as also is how metal-rich ores interfere with the molecular proxies in the temperature regime envisaged for hydrothermal activity.The molecular compositional changes of various polycyclic aromatic steranes and polycyclic aromatic hydrocarbons and compounds derived from the Jinding Pb/Zn deposit,SW China provide new data.Aliphatic regular steranes are present as traces.The transformation from polycyclic aromatic steranes to unsubstituted polycyclic aromatic hydrocarbons is observed to show an increased trend with increasing hydrothermal alteration levels;this is consistent with the transformation from unsubstituted polycyclic aromatic hydrocarbons to heterocyclic compounds.Dehydrocyclization(aromatization)of polycyclic biological compounds and hydrodecyclization(dearomatization)of polycyclic aromatic compounds are two important reaction pathways in hydrothermal systems with moderate temperature.This detailed investigation of organicinorganic interactions of two groups of polycyclic compounds with metal-rich ores provides insights into the questions on how and to what extent the formation of Pb/Zn deposits can be recorded by organics.This work will improve our understanding of carbon reduction,oxidation or condensation in the deep Earth and the carbon exchange between the Earth's crust and mantle,and may shed light on the processes for ultra-deep hydrocarbon exploration.展开更多
Coriander(Coriandrum sativum L.)is recognized for its antioxidant property,as a kind of natural phenolic-rich ingredient.Polycyclic aromatic hydrocarbons(PAHs)present a class of heat-driven hazards in foods,especially...Coriander(Coriandrum sativum L.)is recognized for its antioxidant property,as a kind of natural phenolic-rich ingredient.Polycyclic aromatic hydrocarbons(PAHs)present a class of heat-driven hazards in foods,especially the processed meat.In this study,the effect of coriander root and leaf extract on the formation and inhibition of PAH8 in roasted duck wings was firstly investigated.Coriander root extract(CRE)and coriander leaf extract(CLE)with five concentration groups(200,400,600,800,1000 mg/L)were prepared respectively to marinate the duck wings.CRE marinade exhibited greater inhibitory effect on PAH8 formation in roasted duck wings that ranged from 65.0%-87.4%.The electron spin resonance study indicated a significantly positive correlation between PAH8 and free radical level,suggesting the participation of radicals in PAHs formation.Also,it was speculated that the inhibitory effect on PAH8 was related to the phenolic compounds identified in coriander marinades.CRE made greater inhibitory effect on the formation of PAH8 and could be considered as a kind of natural source to mitigate PAHs in heat-processed meat products.展开更多
The construction of N-fused polycyclic compounds at room temperature via the combination of transition-metal catalyst and photocatalyst has been reported.This novel work has successfully realized LED irradiated C—H a...The construction of N-fused polycyclic compounds at room temperature via the combination of transition-metal catalyst and photocatalyst has been reported.This novel work has successfully realized LED irradiated C—H activation of iodonium ylides.The strategy shows wide substrate scope and ideal functional group tolerance.Our work would be useful for the construction of various heterocyclic compounds.展开更多
基金The National Key Basic Research Program of China under contract No.2013CB429700the National Special Fund for the 12th Five Year Plan of COMRA under contract Nos DY125-12-R-02,DY125-12-R-05 and DY125-11-R-05+2 种基金the National Natural Science Foundation of China under contract Nos 41325021,40830849 and 40976027the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No.XDA11030302the Shandong Province Natural Science Foundation of China for Distinguished Young Scholars under contract No.JQ200913
文摘10 samples of sediments obtained from the South Mid-Atlantic Ridge were measured for the abundances and distributions of polycyclic aromatic compounds（PAHs）. The total concentrations of PAHs（∑PAHs） ranged from 2.768 to 9.826 μg/g dry sediment. The ∑PAHs was higher in sample 22V-TVG10 and sample 26V-TVG05 which were close to hydrothermal fields, with the lowest value in sample 22V-TVG14 which was farthest from hydrothermal fields, suggesting a probable hydrothermal origin of ∑PAHs of samples. Approximately nine kinds of PAHs were identified, and low molecular mass tricyclic and tetracyclic aromatic compounds were predominant in the samples. The concentrations of fluoranthene which were typical as hydrothermal alteration compounds were the highest among PAHs with dry weight between 0.913–3.157 μg/g. The phenanthrene homologue was most abundant in the samples, and the ratios between parent phenanthrene and methylphenanthrene which probably reflected the degree of hydrothermal alteration ranged from 0.097 to 1.602. The sample 22V-TVG10 possessing a maximum ratio value showed the intense influence of the hydrothermal alteration on this sample, which might further imply that PAHs in sediments were mainly derived from the hydrothermal alteration.
文摘The contents of polycyclic aromatic sulfur compounds (PASCs) in the Kupferschiefer varied from sample to sample. Twenty PASCs were determined in the Kupferschiefer from Poland and Germany. Gold enrichment was only observed in samples with higher PASC contents. At the same time, all the samples with gold enrichment originated from areas close to the redox boundary (the front section of Rote Fule) that was formed by oxidizing brines in contact with the reducing Kupferschiefer. It is proposed that the gold-bearing solutions encountered PASCs in the Kupferschiefer. PASCs could easily displace chloride ions from aurous chloride complexes to form stable gold S-chelates. Subsequent oxidation of these gold organic compounds could destroy the organic components and lead to the formation of metallic gold.
文摘A comprehensive summary for the study on the monitoring of potential carcinogenicpolycyclic aromatic compounds (PACs) in the emission of coal combustion is presented in this pa-per. Some PACs in the stack gases of coal-fired boiler have been determined with a procedure whichconsists of isokinetic stack sampling, extraction, preseparation and some instrumental analysis stepssuch as gas chromatographylmass spectrometry (GC/MS), high performance liquid chromatographyfHPLC), room temperature phosphorimetry (RTP) and synchronous fluorescence spectroscopy (SFS)and so on. The results indicate that the air pollution of PACs in China are related closely to thecoal combustion.
基金financially supported by the National Key Research and Development Program of China(Grant No.2019YFA0708504)National Natural Science Foundation of China(Grant Nos.U20B6001,42141021,42102185)。
文摘Continental epithermal ore deposits are commonly associated with sedimentary organic matter,oils or solid bitumen.These organics embedded in mineral deposits can convey valuable information of the ore genesis.However,the extent to which the formation of ore minerals was recorded by organic compounds remains largely unknown,as also is how metal-rich ores interfere with the molecular proxies in the temperature regime envisaged for hydrothermal activity.The molecular compositional changes of various polycyclic aromatic steranes and polycyclic aromatic hydrocarbons and compounds derived from the Jinding Pb/Zn deposit,SW China provide new data.Aliphatic regular steranes are present as traces.The transformation from polycyclic aromatic steranes to unsubstituted polycyclic aromatic hydrocarbons is observed to show an increased trend with increasing hydrothermal alteration levels;this is consistent with the transformation from unsubstituted polycyclic aromatic hydrocarbons to heterocyclic compounds.Dehydrocyclization(aromatization)of polycyclic biological compounds and hydrodecyclization(dearomatization)of polycyclic aromatic compounds are two important reaction pathways in hydrothermal systems with moderate temperature.This detailed investigation of organicinorganic interactions of two groups of polycyclic compounds with metal-rich ores provides insights into the questions on how and to what extent the formation of Pb/Zn deposits can be recorded by organics.This work will improve our understanding of carbon reduction,oxidation or condensation in the deep Earth and the carbon exchange between the Earth's crust and mantle,and may shed light on the processes for ultra-deep hydrocarbon exploration.
基金funded by the National Key R&D Program of China(2016YFD040040303).
文摘Coriander(Coriandrum sativum L.)is recognized for its antioxidant property,as a kind of natural phenolic-rich ingredient.Polycyclic aromatic hydrocarbons(PAHs)present a class of heat-driven hazards in foods,especially the processed meat.In this study,the effect of coriander root and leaf extract on the formation and inhibition of PAH8 in roasted duck wings was firstly investigated.Coriander root extract(CRE)and coriander leaf extract(CLE)with five concentration groups(200,400,600,800,1000 mg/L)were prepared respectively to marinate the duck wings.CRE marinade exhibited greater inhibitory effect on PAH8 formation in roasted duck wings that ranged from 65.0%-87.4%.The electron spin resonance study indicated a significantly positive correlation between PAH8 and free radical level,suggesting the participation of radicals in PAHs formation.Also,it was speculated that the inhibitory effect on PAH8 was related to the phenolic compounds identified in coriander marinades.CRE made greater inhibitory effect on the formation of PAH8 and could be considered as a kind of natural source to mitigate PAHs in heat-processed meat products.
基金the support from Sichuan Science and Technology Program(No.2020YJ0221).
文摘The construction of N-fused polycyclic compounds at room temperature via the combination of transition-metal catalyst and photocatalyst has been reported.This novel work has successfully realized LED irradiated C—H activation of iodonium ylides.The strategy shows wide substrate scope and ideal functional group tolerance.Our work would be useful for the construction of various heterocyclic compounds.
