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علوم خاک soil-science - آماده‌سازی نمونه‌های گیاهی برای اندازه‌گیری عناصر میکرو(روش هضم خشک) Preparation of plant samples for the measurement of micro elements
علوم خاک soil-science
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آماده‌سازی نمونه‌های گیاهی برای اندازه‌گیری عناصر میکرو(روش هضم خشک) Preparation of plant samples for the measurement of micro elements

یک گرم پودر گیاه را که از الک 0.5 میلی‌متری عبور داده شده است را توزین و داخل کروزه ریخته  و در کوره قرار داده می‌شود. در عرض 2 ساعت دمای کوره را کم‌کم افزایش داده تا به 550 درجه سانتیگراد برسد. در این حین بعضی مواقع درب کوره را باز کرده تا عمل ترکیب با اکسیژن هوا بخوبی انجام گیرد. نمونه‌ها 3 تا 4 ساعت در آن دما می‏مانند تا تبدیل به خاکستر سفید شود. سپس کوره را خاموش کرده، نمونه‌ها را از کوره خارج و پس از سرد شدن چند قطره آب مقطر به آن اضافه می‌گردد. سپس 5 میلی‌لیتر HCl ، 2 نرمال اضافه شده و روی بن ماری در دمای 80 درجه سانتیگراد به مدت نیم ساعت گذاشته می‌شود، سپس محتویات داخل کروزه را به یک بالن ژوژه 50 میلی‌لیتری منتقل و به حجم رسانیده و صاف می‌گردد.

Jones JB, 2001. Laboratory guide for conducting soil tests and plant analysis. CRC Press, Boca Raton,FL, pp. 27-160.

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