تعیین دامنه تغییرات مقدار پس‌زمینه طبیعی متغیرهای فیزیکوشیمیایی در منابع آب شرب و ارزیابی ریسک سلامت انسان

نوع مقاله : مقاله پژوهشی

نویسنده

دانشیار هیدروژئولوژی، گروه زمین‌شناسی، دانشگاه یزد

چکیده

هدف از انجام این مطالعه، شناسایی نقش عوامل طبیعی و انسانی در کنترل ترکیب شیمیایی منابع آب شرب شهری و روستایی شهرستان‌های بوئین-میاندشت و فریدونشهر در استان اصفهان است. در اغلب مطالعات، منابع احتمالی متعددی برای متغیرهای فیزیکوشیمیایی آب شرب مطرح شده است. بنابراین، تعیین مقدار و دامنه تغییرات غلظت پس زمینه طبیعی (NBL) این متغیرها می‌تواند در بهبود مدیریت منابع آب و جلوگیری از عواقب ناگوار برای سلامت ساکنین از طریق مصرف آب بسیار موثر باشد. بنابراین، با استفاده از روش‌های آزمون رفع داده پرت تکراری (Iterative 2σ)، تابع توزیع محاسباتی (CDF) و آزمون گربز تکراری (IGT)، NBL 11 متغیر فیزیکوشیمیایی شامل EC، TDS، SO4، F، Cl، NO3، HCO3، Ca، K، Mg، Na محاسبه شده است. فرایند پیش‌انتخاب (PS) دسته داده‌ها بر اساس NO3 و Cl انجام شده است. به دلیل عدم ایجاد توزیع نرمال توسط روش‌های احتمالاتی Iterative 2σ و CDF، مقدار NBL برای متغیرهای SO4، NO3 و Na در دسته داده بوئین-میاندشت و متغیرهای EC، TDS، NO3 و Na در دسته داده فریدونشهر را نمی‌توان با استفاده از آنها محاسبه کرد. بنابراین، برای این متغیرها از روش قطعی (95 درصد داده‌‌های باقیمانده) به عنوان NBL استفاده شده است. محاسبات نشان می‌دهد که مقادیر NBL تعیین شده توسط روش IGT بزرگتر از مقادیر بدست آمده  از روش‌های Iterative 2σ وCDF است. ارزیابی ریسک سلامت انسان از طریق مصرف آب شرب و تماس پوستی با تأکید بر غلظت نیترات نشان می‌دهد که اغلب نمونه های مورد مطالعه در رده بی‌خطر و کم‌خطر قرار دارند و این بیانگر کیفیت بسیار خوب نمونه‌ها برای مصرف شرب است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Determining the natural background level of physicochemical variables of drinking water resources and human health risk assessment

نویسنده [English]

  • Vahab Amiri
Associate Professor of Hydrogeology, Department of Geology, Yazd University, Yazd, Iran
چکیده [English]

This study aims to identify the influence of natural and anthropogenic factors on the chemical composition of drinking water sources in both urban and rural areas of Buin-Miandasht and Fereydounshahr counties in Isfahan province. Previous studies in Iran have suggested various potential sources for the physicochemical variables in drinking water. Therefore, determining the natural background level (NBL) and its range of changes for physicochemical variables is crucial for better groundwater resource management and preventing negative health impacts on consumers. To achieve this, the study calculated the NBL for 11 physicochemical variables (EC, TDS, SO4, F, Cl, NO3, HCO3, Ca, K, Mg, and Na) using the Iterative 2σ, computational distribution function (CDF), and Iterative Grubbs test (IGT) methods. The data set was pre-selected based on NO3 and Cl levels. However, due to the inability to create a normal distribution using the Iterative 2σ and CDF methods, the NBL for SO4, NO3, and Na in the Buin-Miandasht dataset and EC, TDS, NO3, and Na in the Fereydunshahr dataset could not be calculated with these methods. Instead, the deterministic method (95th percentile of the remaining data) was used for these variables. The calculations revealed that the NBL determined by the IGT method was higher than those obtained by the Iterative 2σ and CDF methods. A human health risk assessment, focusing on NO3 concentration, indicated that most of the samples studied were in the safe and low-risk categories, demonstrating the high quality of the drinking water samples.

کلیدواژه‌ها [English]

  • Drinking water
  • natural background level
  • physicochemical variables
  • statistical method
  • human health risk assessment

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  • تاریخ دریافت: 13 مهر 1402
  • تاریخ بازنگری: 15 مرداد 1403
  • تاریخ پذیرش: 27 شهریور 1403
  • تاریخ اولین انتشار: 27 شهریور 1403
  • تاریخ انتشار: 01 مهر 1403

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