[Occurrence and Risk Assessment of -nitrosamines and Their Precursors in Qingjiang River Basin].

-nitrosamines are a type of nitrogen-containing organic pollutant with high carcinogenicity and mutagenicity. In the main drinking water sources of small and medium-sized towns in China, the contamination levels of -nitrosamines remain unclear. In addition, there is still lack of research on the concentration of -nitrosamines and their precursors in tributary rivers.

[Pollution Characteristics of Organochlorine Pesticides in Water and Sediments of Huixian Karst Wetland in Guilin].

Karst wetland plays an important role in the ecological environment; however, due to the existence of karst pipeline, pollutants can threaten the underground environment through the highly developed karst pipeline. Therefore, understanding the pollution characteristics of the karst surface environment is the premise of pollution ecological risk assessment and prevention. In this study, 24 organochlorine pesticides (OCPs) were analyzed to study the concentration, composition, source, and risk of OCPs in water and surface sediments in the Huixian Wetland of Guilin.

[Characteristics and Source Analysis of Heavy Metals in Farmland Soil on the South of Dongting Lake].

Based on the grid distribution method, 1589 topsoil samples were collected from farmland on the south side of Dongting Lake from April to August 2020. The content, potential ecological risk, spatial distribution characteristics, and source analysis of heavy metals in the soil were studied. The concentrations and pH of As, Cd, Pb, Cu, Zn, Ni, Cr, and Hg in the soil were determined using ICP-MS, ICP-OES, HG-AFS, and ISE methods.

[Pollution and Potential Ecological Risk Assessment of Heavy Metals in Surface Sediments of Tangxun Lake].

In order to understand the pollution characteristics, spatial distribution, potential sources, and ecological risk of heavy metals in the sediments of Tangxun Lake, the contents of heavy metals (As, Hg, Cd, Cr, Cu, Pb, Zn, and Ni) in the surface sediments of Tangxun Lake were analyzed, and the pollution status and potential ecological risk degree of heavy metals in the sediments were evaluated using the geo-accumulation index and potential ecological risk index. The potential sources of heavy metal pollutants were analyzed by correlation and principal component analysis. The results showed that except for Cr, the contents of other heavy metals were higher than their background values.

[Characteristics and Sources of 12 Trace Amount Elements in PM During a Period of Heavy Pollution in Huanggang, Central China].

This study provides data and theoretical support for the prevention and control of air pollution in central China. From January 13, 2018, to January 25, 2018, 48 PM samples were collected in Huanggang by particulate matter samplers during a severe pollution episode. Twelve elements (Li, Be, V, Se, Sr, Mo, Ag, Ba, Tl, Th, Bi, and U) were analyzed by ICP-MS.

[Characteristics and Sources of Elements in PM During Summer for Three Typical Cities in Pingdingshan-Suizhou-Wuhan, Central China].

This study investigates the elemental characteristics and sources of aerosol fine particulate matter (PM) samples obtained from Pingdingshan, Suizhou, and Wuhan, Central China, in June 2017. Thirteen kinds of elements (Ti, Zn, Cu, Cr, As, Pb, Fe, Ni, Se, V, Sb, Cd, and Co) were analyzed by inductively coupled plasma mass spectrometry (ICP-MS), and three source identification methods-enrichment factor, principle component analysis and multiple linear regression (PCA-MLR), and backward trajectory clustering-were applied. The results showed that Zn was the highest trace element in PM in samples from Pingdingshan, Suizhou, and Wuhan, and that the concentration of As exceeded the annual limit of Chinese air quality standards (GB 3096-2012).

[Pollution Characteristics of PAHs in Soil from a Remote Mountain Wetland-Dajiuhu Lake, Shengnongjia].

Ten sampling points were distributed approximately equidistantly in the Dajiuhu lake wetland, and soils from the depths 0-10 cm, 10-20 cm, and 20-30 cm were collected in April 2012. Gas chromatography-mass spectrometry (GC-MS) was used to analyze the remote mountain wetland shallow soils, and 16 kinds of USEPA priority controlled polycyclic aromatic hydrocarbon (PAH) pollutants were identified. The ∑PAHs content ranges of the shallow soils of this region were 48.

[Characteristics of VOCs Pollution in the Winter Atmosphere of a Typical Petrochemical Industry Park].

Concentrations of volatile organic compounds (VOCs) in ambient air of a typical petrochemical industry park were measured using an on-line monitor (TH-300B) from December 2014 to February 2015. The composition, temporal variations, sources, and photochemical reactivity of VOCs were analyzed. Alkanes were the most abundant VOC species and contributed to 86.

[Polycyclic Aromatic Hydrocarbons in the Atmosphere of Dajiuhu, Shennongjia, China].

The concentration, potential source and health risks of 16 polycyclic aromatic hydrocarbons (PAHs) in the atmosphere of Dajiuhu, Shennongjia, China, were studied. Polyurethane foam (PUF) Passive air samplers (PAS) were settled. The results indicated that the total concentrations of 16 PAHs in different samples ranged from 6.

[Distribution, Sources and Risk Assessment of the PAHs in the Surface Sediments and Water from the Daye Lake].

8 surface sediments and 8 water samples were collected from the Daye Lake in August 2015.The 16 kinds of EPA control polycyclic aromatic hydrocarbons (PAHs) were analyzed by GC-MS.The results showed that the PAHs concentrations of surface sediments and water ranged from 35.

[Concentration, Water-Soluble Ionic and Polycyclic Aromatic Hydrocarbons Composition and Sources of PM During Summer in Hongshan District, Wuhan].

Atmospheric PM samples were collected in Hongshan district, Wuhan from June 12 to July 22, 2014. This study analyzed the characteristics and chemical composition of PM, and the concentrations of Polycyclic Aromatic Hydrocarbons (PAHs) were analyzed by gas chromatography-mass spectrometry (GC-MS), to discuss the pollution sources and formation mechanism. The results indicated the total concentrations of PM ranged from 36.

[Distribution Characteristics of Polycyclic Aromatic Hydrocarbons in Different Environmental Media from Qingbang Island, Zhoushan, China].

Eleven soil, three seawater and three passive air samples were collected from Qingbang Island in July, 2013, and 16 polycyclic aromatic hydrocarbons (PAHs) were analyzed. The distribution characteristics, possible sources and ecological risk assessment were investigated. The results showed that the concentrations of total 16 PAHs ranged between 60.

Polycyclic aromatic hydrocarbons (PAHs) in multimedia environment of Heshan coal district, Guangxi: distribution, source diagnosis and health risk assessment.

Mining activities are among the major culprits of the wide occurrences of soil and water pollution by PAHs in coal district, which have resulted in ecological fragilities and health risk for local residents. Sixteen PAHs in multimedia environment from the Heshan coal district of Guangxi, South China, were measured, aiming to investigate the contamination level, distribution and possible sources and to estimate the potential health risks of PAHs. The average concentrations of 16 PAHs in the coal, coal gangue, soil, surface water and groundwater were 5114.

[Distribution and enrichment characteristics of organochlorine pesticides in water and halobios from Qingbang Island in Zhoushan, China].

A total of 14 biological samples and 3 water samples were collected from the Qingbang Island. The concentrations of OCPs in the samples were determined by GC-ECD to investigate the distribution, composition, source and potential health risks of these compounds in the study area. The results showed that OCPs were detected in all samples.

[Distribution characteristics of organochlorine pesticides in bank soil samples and estuarial sediment core of the Minjiang River, Southeast China].

The 19 soil samples and one sediment core were collected from near the banks and in estuary of the Minjiang River. The concentrations of OCPs in the samples were determined by GC-ECD with the internal standard method. The results showed that the concentrations of OCPs, HCHs, DDTs in soils near the banks of Minjiang were in the ranges of 4.

[Distribution character of polycyclic aromatic hydrocarbons in soils from the karst cavity, Guilin City, South China].

We investigated the distribution characteristic of polycyclic aromatic hydrocarbons (PAHs) of soils from Dayan cave, a karst cavity in Guilin City, South China. The total PAHs concentrations from the inner cave ranged from 7.22 to 117.