سینتیک آزاد شدن منگنز در برخی از خاکهای آهکی ایران

نوع مقاله: مقاله پژوهشی

نویسنده

دانشگاه تبریز

چکیده

شرایط آزمایشگاهی مورد مطالعه قرار گرفت. مقایسه ضرایب تبیین و انحراف معیار مدلهای گوناگون سینتیکی نشان داد که
که بهترین مدلها برای توصیف داده ها، معادله دو ثابته و معادله پارابولیک پخشیده میباشند. معادلات درجه صفر، درجه
اول، دوم و درجه سوم نتوانستند واجذب منگنز را در خاکهای مورد مطالعه توصیف کنند. ضرایب تبیین از معادله درجه
صفر تا درجه سوم کاهش نشان داد. کربن آلی و مقدار رساز تأثیرگذارترین ویژگیهای خاک بر واجذب منگنز و ضرایب
a معادلات سینتیکی دو ثابته و پارابولیک بودند. مقدار منگنز قابل عصارهگیری برای زمانهای طولانی مدت (مرتبط با ثابت
0 و بیشترین / معادله دو ثابته برابر با 585 a معادله دو ثابته) با افزایش مقدار ماده آلی خاک افزایش یافت. کمترین مقدار ثابت
0 و / به ترتیب برابر با 313 b 11 میلیگرم منگنز بر کیلوگرم خاک بر دقیقه بوده و مقادیر متناظر برای ثابت / آن برابر با 24
به کلی متغیر (b 0/554 یک بر میلیگرم منگنز بر کیلوگرم خاک میباشد. سرعت عصارهگیری منگنز از خاک (مرتبط با ثابت
بوده و بطور سیستماتیک به هیچ کدام از خواصخاک مرتبط نشد. نتایج تحقیق حاضر نشان داد که احتمالا آزمون رایج
خاک برای منگنز، مقدار منگنز، قابل استفاده گیاه را کمتر از مقدار واقعی تخمین می زند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Kinetics of Manganese Release From Some Calcareous Soils of Iran

نویسنده [English]

  • A Reyhanitabar
چکیده [English]

Kinetics of native Mn desorption by diethlenetriaminepentaacetic acid (DTPA) from 12 calcareous soils
of Iran was studied in a laboratory experiment. Comparisons of coefficients of determination (r 2 ) and
standard errors (SE) for seven different models indicated that the two best models for describing the
desorption data in all soils were two-constant rate and parabolic – diffusion equations. The zero, first,
second and third order equations could not describe Mn desorption properly and the coefficients of
determination (r 2 ) decreased from zero to third order. Organic carbon and clay contents were the most
pertinent soil characteristics that predicted the rate constants of the two constant and parabolic kinetic
models. The amount of extractable Mn for long extraction times (the constant ˝a˝) increased with
organic matter content. Constant ˝a˝ ranged from 0.585 to 11.24 (mgMn kg-1min-1) and ˝b˝ from o.313 to
0.554(mgMn kg-1min-1)-1. The rate at which Mn was extracted from each soil (related to the constant b)
were quite variable and was not systematically related to any of the measured soil properties.
Consequently a soil test for available Mn involving extraction for a quite short time period might
underestimate the amount of Mn that was released in reality.

کلیدواژه‌ها [English]

  • Calcareous soils
  • Desorption
  • DTPA
  • kinetics
  • Mangeness
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