伊朗北部Mazandaran省里海沿岸正构烷烃的成岩和生物成因输入

Q3 Environmental Science Applied Environmental Research Pub Date : 2022-03-29 DOI:10.35762/aer.2021.44.1.8
Seyed Raheb Hosseini Bizaki, Ahmad Reza Rabbani, A. Riyahi Bakhtiari, M. Cheraghi, Parisa Babaie
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引用次数: 1

摘要

里海是世界上最大的湖泊,面临着越来越大的污染风险。海基和陆基碳氢化合物的输入是里海最关键的污染物。本研究采用正构烷烃及其诊断比值对马赞达兰省里海南部沿海表层沉积物中烃类污染物的来源进行了识别。从海平面以下5米深处采集了27个地表沉积物样本。采用索氏仪提取污染物成分,气相色谱-质谱联用分析。结果表明,正构烷烃的总浓度(ΣHC)在5.2µg -1 ~ 690.7µg -1之间。S20 (Noshahr港选定的监测站)的浓度最高,大多数监测站的浓度在中等范围。采用5种诊断比值对马赞达兰省岸线岩源污染物和生物源污染物进行了区分。碳偏好指数(Carbon Preference Index, CPI)、LMW/HMW、Pr/n-C17、Phy/n-C18、Pr/Phy和U/R值反映了各测站的产岩输入。然而,在一些站点还检测到生物源输入。岩质污染物几乎来自海基输入,如土库曼斯坦和阿塞拜疆的石油泄漏。另一方面,生物污染物几乎来自河流和海卡尼亚森林。
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Petrogenic and Biogenic Inputs of n-alkanes along Shoreline of the Caspian Sea in the Mazandaran Province, North of Iran
The Caspian Sea is the largest lake in the world and is facing an increasing risk of contamination. Sea-based and land-based hydrocarbons inputs are the most critical pollutants of the Caspian Sea. In the present study, n-alkanes and related diagnostic ratios were used to identify the sources of hydrocarbon contaminants in surface sediments along the southern coastal area of the Caspian Sea in Mazandaran province. 27 surface sediment samples were collected from a depth of 5 meters under sea level. Contaminant’s compositions were extracted by Soxhlet apparatus and analyzed by Gas Chromatography-Mass Spectrometry. According to the results, the total concentration of n- alkanes (ΣHC) ranged from 5.2 µg g-1 to 690.7 µg g-1. The S20 (selected station in Noshahr port) had the highest concentration, and most of the stations have levels in a moderate range. Five diagnostic ratios are used to distinguish petrogenic and biogenic contaminants in shorelines of the Mazandaran province. In all stations, Carbon Preference Index (CPI), LMW/HMW, Pr/n-C17, Phy/n-C18, Pr/Phy, and U/R values indicated the petrogenic inputs. However, in some stations biogenic inputs were additionally detected. The petrogenic pollutants were almost from sea-based inputs such as oil spills from Turkmenistan and Azerbaijan. On the other hand, biogenic contaminants were almost from rivers and Hyrcania forests.
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Applied Environmental Research
Applied Environmental Research Environmental Science-Environmental Science (all)
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