Determinação das formas de nitrogênio e nitrogênio total em rochas-reservatório de petróleo por destilação com arraste de vapor e método do indofenol

Química Nova

Lílian Irene Dias Da Silva¹  Manuel Castro Carneiro¹  Vanessa Dos Santos Emídio¹  Sérgio De Souza Henrique Junior¹  Maria Inês Couto Monteiro¹ 

[1] ,Centro de Tecnologia MineralRio de Janeiro RJ

关键词: nitrogen;    rock;    soil;   

DOI  :  10.1590/S0100-40422006000100010

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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