risk assessment of heavy metals contamination in soils and selected crops in zanjan urban and industrial regions
نویسندگان
چکیده
introduction: heavy metals are types of elements naturally present in soil or enter into soil as a result of human activities. the most important route of exposure to heavy metals is daily intake of food. crops grown in contaminated soil (due to mining activities, industrial operations and agriculture) may contain high concentrations of heavy metals. also closeness to cities and industrial centers can have a great influence on the accumulation of heavy metals to agricultural products grown in the region. the study aimed to determine the concentration of heavy metals in soil and agricultural products around urban and industrial areas of zanjan province (north west of iran) and consumption hazard probability. materials and methods: soil (75 samples of soil from a depth of 0 to 10 cm) and plant (101 samples) samples, in the summer 2011, were randomly taken from industrial areas as follow: tomatoes (lycopersicum esculentum m), wheat seed (triticum vulgare), barley seeds (hordeum vulgare), alfalfa shoots (medicago sativa l.), potato tubers (solanumtuberosum l.), apple fruit, vegetables and fruits such as dill (aniethum graveolens l.), leek (allium porrum l.), gardencress (barbara verna l.) and basil (ocimum basilicum l.). plant samples were then washed with distilled water, oven dried for48 hours at a temperature of 70 ´c until constant weight was attained and then they digested using 2 m hydrochloric acid (hcl) and nitric acid digestion in 5 m. concentrations of heavy metals in the soil and crops were determined by atomic absorption spectrometry. dtpa extraction of metals by lindsay and norvell (1978) method and sequential extraction method by tessier et al. (1979) were performed. statistical analysis was accomplished using the software spss 16.0 and the comparison of mean values was done using the duncan test at the 5% level of significance. results and discussion: the magnitude of variations for total copper was from 11.5 to 352.5 (average 52.4), zinc was from 96.3 to 1353.8 (average 264.8), lead was between 40.0 and 470.0 (average 105.7), nickel ranged from 12.8 to 77.0 (average 46.7) and chromium varied from 10.0 to 49.5 (average 21.7) mg kg-1. dtpa extracted heavy metals for copper varied from 1.50 to 21.23, averaging 4.47, zinc from 0.57 to 76.50 averaging 23.15, lead from 2.43 to 63.38 averaging 16.81 and nickel from 0.28 to 2.32 averaging 1.20 mg kg-1. chemical changes in the different fractions were as follows: cu (residual > bounded to organic matter > bounded to fe-mn oxides > bounded to carbonate > exchangeable fraction), zn and ni (residual > bounded to fe-mn oxides > bounded to carbonate > bounded to organic matter > exchangeable fraction,) and pb (residual > bounded to fe-mn oxides > bounded to organic matter > bounded to carbonate > exchangeable fraction). the concentration of heavy metals in plant parts were high with respect to studied location. the highest amounts of zn (gardencress), pb (dill), cu (leek), ni (basil) and cr (basil), respectively were found to be 150.25, 41.25, 23.13, 6.46 and 3.47 mg kg-1 and the minimum amounts of the metals studied were found in fruits, wheat and barley grains. the total amount of metals in plants were as follow (zn >> pb > cu > ni > cr). bioaccumulation factor (baf) of metals in plants were as zn=cu > pb >> cr > ni. hazard probability (hq) in cancerous diseases for each element (except pb) in both children and adults was less than unit. hq content of pb was much higher than the unit and for children and adults 9.07 and 6.94, respectively showing high contribution of pb contamination of crops that threatens the consumer health in that location. the total amount of risk (thq) in children was higher than that in adults. conclusions: the results obtained in this study indicate that an urgent attention is required for consumer products related to public health, especially vegetables grown in the studied regions. toxic effects of heavy metals have many deleterious effects which are more pronounced over time. with conventional monitoring of food quality produced in farms and presented in markets, excessive accumulation of heavy metals entering in to the human food chain can be prevented. also, we can change the risk potential of heavy metals in the region by growing vegetables which accumulate heavy metals.
منابع مشابه
accumulation of heavy metals (cu, zn, cd and pb) in sediment and selected organisms in lukut river, negrisembilan, malaysia, and toxocological studies of heavy metals (cu, zn, cd and pb) on penaeus monodon (fabricius, 1798) juveniles
چکیده ندارد.
15 صفحه اولAssessment of carcinogenic and non-carcinogenic hazards of heavy metals in surface soils of Bandar Mahshahr industrial zone in 1398
Background: Non-biodegradation in nature and the creation of adverse health effects in humans is important features of heavy metals. The main purpose of this study was to determine the carcinogenic and non-carcinogenic risks of heavy metals As, Cd, Cu, Cr, Pb, Ni, V, and Zn in the soils of industrial areas of Mahshahr port for adults and children. Methods: To study the environmental effects of ...
متن کاملAssessment of Heavy Metal Contamination in Surface Soils of Ahvaz IV Industrial Estate, Khuzestan Province, Iran
Background and Purpose: In the environment, heavy metals in high concentration are toxic to most organisms. Human activities have continuously increased the concentration of these metals in the environment such as soils. In the present study, soil samples collected from Ahvaz IV industrial estate in Khuzestan Province. Materials and Methods: The soil samples were taken from 9 ...
متن کاملAccuracy Assessment of Geostatistical Methods for Zoning of heavy metals in soils of urban-industrial areas
According to the IPI (integrated pollution index) report, almost 65 percent of all cities and dust of their roads were polluted with heavy metals. These areas threaten the health of human. Identifying, mapping and monitoring the pollution are the first step in contamination management. Hence, in recent decades many methods are presented to identify and mapping based on computer software that am...
متن کاملConcentration of Heavy Metals in Soil and Staple Crops and the Associated Health Risk
Background & Aims of the Study: The main objectives of the current research were (1) to study the extent of soil pollution by heavy metals (Ag, Cd, Cr, Cu, Mn, Ni, Pb, Zn, Ba and Li) in sampling locations (2) to investigate the extent of heavy metal pollution and soil to plant transfer of these elements in wheat and barley (3) to study the health risk of heavy metals via consum...
متن کاملmorphology, geochemistry, mineralogy, and micromorphology of soils of hormozgan province in relation to parent materials
ویژگی های زمین شیمیایی، کانی شناسی، و میکرومورفولوژیکی خاک ها و سنگ مادر مربوطه در منطقه بین بخش های جنوبی زاگرس و خلیج فارس تا دریای عمان(استان هرمزگان، ایران) مورد بررسی قرار گرفت. هدف های این مطالعه شناسایی تغییرات در خصوصیات فیزیکی، شیمیایی، و ترکیب کانی شناسی خاک، مطالعه میکرومورفولوژی و تکامل خاک، و بررسی توزیع عنصر خاک بر اساس هوازدگی، پروسه های خاک و زمین شناسی جهت توصیف اثرات مواد مادر...
15 صفحه اولمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
آب و خاکجلد ۲۹، شماره ۱، صفحات ۱۵۱-۰
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023