| کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
|---|---|---|---|---|
| 5119303 | 1485867 | 2017 | 6 صفحه PDF | دانلود رایگان |
کلمات کلیدی
1.مقدمه
2- مواد و روش‌ها
2-1- منطقه تحت بررسی
2-2- نمونه برداری از خاک
2-3- روش
2-3-1- پلی کلرو بی‌فنیل‌ها
2-3-2- فلزات سنگین
3. نتایج و بحث
3.1. غلظت PCB ها در خاک
شکل 1: مناطق تحت بررسی و غلظت PBCها
3-2- غلظت فلزات سنگین در خاک
جدول 1: آمار تشریحی از غلظت فلزات نسبت به فاصله در نمونه‌های خاک در نزدیکی خط ریلی (mg/kg)
شکل 2. غلظت Cu و Zn بسته به فاصله از راه آهن.
3-3- ارزیابی میزان آلودگی
جدول 2: ارزیابی استانداردهای درجه‌بندی در روش شاخص آلودگی تکی
جدول 3- شاخص آلودگی هر فلز سنگین در منطقه نمونه‌گیری
3-3-1- شاخص آلودگی Nemerow
4- نتیجه‌گیری
- PCBs are present in the soil next to the railroad and do not exceed admissible pollution levels.
- Levels of Cu, Zn, Ni and Pb in soil are most associated with human activities along the railroad.
- The most polluted area is located at a distance up to 1Â km from the railroad and nearby railway stations.
Surface soil (0-10Â cm) samples from 60 sampling sites along the length of railway tracks on the territory of Srem (the western part of the Autonomous Province of Vojvodina, itself part of Serbia) were collected and analyzed for seven polychlorinated biphenyls (PCBs) and ten heavy metals in order to see how the distance from the railroad affects the concentration of some organic and inorganic pollutants in the soil. Samples were taken at a distance of 0.03-4.19Â km from the railway. For the soil extraction was used USEPA 3540S method. The extracts were purified on a silica-gel column (USEPA 3630C). The analysis of the extracts was performed by gas chromatography with tandem mass spectrometry. PCBs were not detected only at two locations. Mean total concentration of PCBs for all other sampling locations was 0.0043Â ppm dry weight (dw) with a range of 0.0005-0.0227Â ppm dw. According to values of Nemerow pollution index Cu, Co, Zn and Ni were the most ubiquitous heavy metals in the area near railroad. Based on these results, it can be said that railway transport is a potential source of PCBs and some heavy metals.
Journal: Transportation Research Part D: Transport and Environment - Volume 57, December 2017, Pages 124-129