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غیرمتحرک کردن روی (Zn) در دو خاک آلوده به روی | ||
دانش آب و خاک | ||
مقاله 6، دوره 21، شماره 3، آبان 1390، صفحه 75-90 اصل مقاله (221.84 K) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
معصومه فریادی شاهگلی؛ شاهین اوستان* ؛ ناصر علی اصغرزاد؛ نصرتاله نجفی | ||
دانشکده کشاورزی دانشگاه تبریز | ||
چکیده | ||
استفاده از غیرمتحرک کنندهها یکی از روشهای مؤثر برای کاهش اثرات زیانآور فلزات سنگین در خاک است. در پژوهش حاضر کارایی این روش برای کاهش میزان Zn محلول و قابلاستخراج با DTPA دو خاک قلیایی و اسیدی آلوده به Zn (200 میلیگرم Znبر کیلوگرم خاک از منبع سولفات روی و دو هفته نگهداری در دمای C° 5/0±25 در اینکوباتور) مورد بررسی قرار گرفت. دو خاک قلیایی و اسیدی آلوده به Zn در دو شرایط رطوبتی ظرفیت مزرعه و غرقاب (با و بدون 50 گرم کود گاوی بر کیلوگرم خاک) قرار گرفته و به مدت یک ماه در اینکوباتور نگهداری شدند. نتایج نشان داد که تیمار غرقاب با مصرف کود گاوی، بیشترین کاهش را در Zn محلول و قابل استخراج با DTPA خاک قلیایی (به ترتیب 97 و 75 درصد) و اسیدی (به ترتیب 85 و 78 درصد) سبب شد. برای بررسی اثر مواد فسفاتی، پنج گرم فسفر بر هر کیلوگرم خاک از منابع مونوکلسیم فسفات، تریکلسیم فسفات، پتاسیم مونوهیدروژن فسفات، پتاسیم دیهیدروژن فسفات و اسید فسفریک به خاک اسیدی آلوده اضافه گردید. نتایج نشان داد که Zn محلول در تیمار پتاسیم مونوهیدروژن فسفات 88 درصد و Zn قابلاستخراج با DTPA در تیمار تریکلسیم فسفات 5/12 درصد کاهش یافتند. در آزمایشی دیگر، افزودن 10 گرم کربنات کلسیم بر کیلوگرم خاک اسیدی آلوده شده، سبب کاهش Zn محلول به میزان 97 درصد و قابلاستخراج با DTPA به میزان 43 درصد گردید. | ||
کلیدواژهها | ||
غرقاب کردن؛ مواد فسفاتی؛ Zn قابل استخراج با DTPA؛ Zn محلول | ||
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