مطالعه سینتیک آزادسازی پتاسیم از چند کانی میکایی با استفاده از عصاره‌گیرهای استات آمونیم و تترافنیل بوران سدیم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه فردوسی مشهد

2 عضو هیات علمی دانشگاه فردوسی مشهد

چکیده

این پژوهش با هدف مقایسه قابلیت دو عصاره‌گیر استات آمونیوم (NH4OAc) و تترا فنیل بوران سدیم (NaBPh4) در رها‌سازی پتاسیم از کانی‌های میکایی بیوتیت، فلوگوپیت و موسکویت انجام شد. در این راستا، رها‌سازی پتاسیم در کانی‌های مذکور در بازه زمانی 5 تا 11520 دقیقه توسط هر دو عصاره‌گیر انجام شد و سینتیک رهاسازی پتاسیم توسط رگرسیون غیرخطی معادلات شبه درجه دوم، تابع توانی، ایلوویچ و پخشیدگی پارابولیک مورد بررسی قرار گرفت. نتایج حاکی از آن بود که عصاره‌گیر NaBPh4 توانایی بیشتری در خروج پتاسیم از هر سه کانی میکایی دارا است. تترا فنیل بوران سدیم به‌ترتیب 15/56، 14/60 و 78/10 درصد از پتاسیم کل کانی‌های فلوگوپیت، بیوتیت و موسکویت را آزاد کرد در حالی که این مقادیر برای عصاره‌گیر NH4OAc به‌ترتیب 81/0، 84/0 و 62/0 درصد بود. روند رها‌سازی پتاسیم از کانی‌ها دارای دو فاز رها‌سازی سریع در مراحل اولیه و رها‌سازی با سرعت کمتر تا انتهای آزمایش بود. سرعت آزاد شدن پتاسیم در کانی­های بیوتیت و فلوگوپیت توسط معادله تابع توانی به‌خوبی توصیف گردید (99/0-98/0=R2 و 43/2-20/1=SE ). علاوه بر معادله تابع توانی، معادله ایلوویچ نیز دارای برازش خوبی برای کانی فلوگوپیت بود (98/0=R2 و 23/2=SE). همچنین نتایج نشان داد که معادله پخشیدگی پارابولیک دارای بهترین برازش برای کانی موسکویت بود (87/0=R2 و 26/1=SE). بنابراین، می‌توان گفت که سرعت آزاد شدن پتاسیم به‌وسیله پخشیدگی از سطح کانی‌ها کنترل می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

The Study of Kinetics of Potassium Release by Ammonium acetate and Sodium tetraphenylborate Extractants from Selected Micaceous Minerals

نویسندگان [English]

  • Hadis Hatami 1
  • Alireza Karimi 2
  • Amir Fotovat 1
  • Amir Lakzian 1
1 Ferdowsi University of Mashhad
2 Ferdowsi University of Mashhad
چکیده [English]

The objectives of this study were to compare the capability of ammonium acetate (NH4OAc) and sodium tetraphenylborate (NaBPh4) in the release of potassium from micaceous minerals including biotite, phlogopite and muscovite. Non-linear regression of pseudo second-order, power function, Elovich and parabolic diffusion equations models inspected to describe potassium release from those minerals in a period of 5 to 11520 minute. The results indicated that the amount of NaBPh4-extractable K was s higher than NH4OAc-extractable K. NaBPh4 extractant released 56.15, 60.14 and 10.78% of total potassium from phlogopite, biotite and muscovite respectively, while those values were 0.81, 0.84 and 0.62% for NH4OAc extractant. The results also showed that the potassium released from minerals in two different phases. The rapid phase occurred at the beginning of experiment and the second phase with lower rate release happened until to the end of experiment. Parabolic diffusion and exponential function equations reasonability described the potassium release from micaceous minerals very well according to R2 and SE indexes. Kinetics of potassium release from biotite and phlogopite minerals were described very well by power function equation (R2=0.98-0.99 and SE=1.20-2.43). The best-fitted kinetic models for the phlogopite (R2=0.98 and SE=2.23) and muscovite (R2=0.87 and SE=1.26) minerals were Elovich and parabolic diffusion equations respectively. Therefore, it may be concluded that the release of potassium is controlled by diffusion process from the surface of the studied minerals.

کلیدواژه‌ها [English]

  • Available potassium
  • biotite
  • Phlogopite
  • Kinetic equations
  • Muscovite

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تحقیقات آب و خاک ایران
دوره 47، شماره 2
مرداد 1395
صفحه 377-386

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