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Química Nova

versão impressa ISSN 0100-4042versão On-line ISSN 1678-7064

Resumo

SILVA, Lílian Irene Dias da et al. Determination of nitrogen forms and total nitrogen in petroleum reservoir rocks by steam distillation and the indophenol method. Quím. Nova [online]. 2006, vol.29, n.1, pp.46-51. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422006000100010.

Several extraction procedures are described for the determination of exchangeable and fixed ammonium, nitrate + nitrite, total exchangeable nitrogen and total nitrogen in certified reference soils and petroleum reservoir rock samples by steam distillation and indophenol method. After improvement of the original distillation system, an increase in worker safety, a reduction in time consumption, a decrease of 73% in blank value and an analysis without ammonia loss, which could possibly occur, were achieved. The precision (RSD < 8%, n = 3) and the detection limit (9 mg kg-1 NH4+-N) are better than those of published procedures.

Palavras-chave : nitrogen; rock; soil.

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