غیرمتحرک کردن روی (Zn) در دو خاک آلوده به روی

نوع مقاله : مقاله پژوهشی

نویسندگان

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

عنوان مقاله [English]

Zinc Immobilization in Two Zn-Spiked Soils

نویسندگان [English]

  • M Faryadi Shahgoli
  • SH Oustan
  • N Aliasgharzad
  • N Najafi
چکیده [English]

         Chemical immobilization is an operative approach to reduce detrimental effects of heavy metals in soils. The present study was conducted to test the usefulness of this procedure to decrease soluble and DTPA-extractable Zn in two Zn-spiked (addition of 200 mg Zn kg–1soil from zinc sulfate and incubation for two weeks at 25±1ºC) acid and alkaline soils. In order to study the effect of submergence, two Zn-spiked acid and alkaline soils under two moisture conditions (field capacity [FC] and submergence [S], with and without 50 g cow manure/kg soil [M]) were incubated for one month. Results showed that S+M treatment caused a markedly decrease in soluble and DTPA-extractable Zn in both alkaline (97 and 75%, respectively) and acid (85 and 78%, respectively) soils. To evaluate the effect of phosphate amendments, 5 g P/kg soil from various sources (Ca(H2PO4)2.H20, Ca3(PO4)2, H3PO4, K2HPO4 and KH2PO4) was added to the Zn-spiked acid soil. Results showed that the K2HPO4 treatment caused a markedly decrease in soluble Zn (88%). Neverthless DTPA-extractable Zn decreased (12.5%) in Ca3(PO4)2 treatment. In another experiment the addition of calcium carbonate to acid soil (10 g CaCO3 kg-1 soil) caused a markedly decrease in soluble and DTPA-extractable Zn (97 and 43%, respectively).

کلیدواژه‌ها [English]

  • DTPA-extractable Zn
  • Phosphate amendment
  • Soluble-Zn
  • Submergence

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