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- W2018176616 abstract "Abstract The Colorado State University biosolids research program has routinely used concentrated nitric acid for digesting plant tissue for subsequent inductively coupled plasma‐atomic emission spectrometry analyses. The original method outlined by Havlin and Soltanpour calls for samples to be heated on an aluminum block at 125°C until the liquid volume is reduced to 2–3 mL. However, some plant species require >17 hours to reduce to 3 mL, while other plant species boil out of the digestion tubes at 125°C; some do both. The objective of this research was to determine if a timed digestion period could yield similar results to the original volume reduction method for plant species routinely analyzed in our laboratory. We performed digests on winter wheat grain and straw (Triticum aestivum L., ‘TAM 107'), fringed sage (Artemisia frigida Willd.), and an NIST wheat flour standard (NIST Standard Reference Material 1567a). We predigested 1.00 g plant material in 10 mL of concentrated nitric acid (69% by weight) at room temperature for 24, 48, or 72 hours, and we predigested plants for 24 hours followed by sample placement on an aluminum block digester. All samples were vortexed at 6, 24, 48, or 72 hours, accordingly. Block samples were initially digested at 80°C until fuming ceased, followed by an increase in temperature to 120°C and digested for 2, 4, 6, or 8 hours, or volume reduction to 3 mL. We used four replications and two blanks for all digests. We analyzed all samples using ICP‐AES and compared all results to the original digestion method. Overall comparison of all plants showed the block digestion to be superior to all predigestion periods. Winter wheat grain digested the quickest on the block, with all digests being complete within ∼4 hours. The 4 hour block digestion compared well with the normal digest for our wheat grain. The 8 hour block digestion period for the other plant species all compared well with the normal digest. We suggest the following procedural modification: predigest all samples for 24 hours, with subsequent vortexing at 6 and 24 hours; place samples on an aluminum block at 80°C until fuming ceases; increase the temperature to 120°C and digest for 8 hours or until 3 mL remain, whichever occurs first." @default.
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- W2018176616 date "2000-09-01" @default.
- W2018176616 modified "2023-09-27" @default.
- W2018176616 title "Modified nitric acid plant tissue digest method" @default.
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- W2018176616 doi "https://doi.org/10.1080/00103620009370602" @default.
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