Autoclave-induced digestion for the colorimetric determination of silicon in rice straw.
1991
Elliott C.L. | Snyder G.H.
Low Si content of rice (Oryza sativa L.) straw is known to be associated with poor rice grain yields, and the need for Si fertilization can be assessed on the basis of the Si content of rice straw. Current methodologies for determining Si in plant tissue are tedious and slow and/or involve cumbersome safety precautions. A new method [autoclave-induced digestion (AID)] has been developed. Plant tissue is digested with H2O2 and NaOH in an autoclave, and Si is determined by standard colorimetric techniques that can be automated. For rice straw ranging in Si content from < 1 to > 5%, the AID method was linearly correlated (r = 0.999) with Si determination by NaOH fusion, with an intercept near zero and a slope near 1.
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