Determination of nitrogen forms and total nitrogen in petroleum reservoir rocks by steam distillation and the indophenol method

Química Nova

Centro de Tecnologia Mineral, Rio de Janeiro¹  Henrique Junior, Sérgio de Souza¹  Emídio, Vanessa dos Santos¹  Carneiro, Manuel Castro¹  Monteiro, Maria Inês Couto¹  Silva, Lílian Irene Dias da¹ 

关键词: nitrogen;    rock;    soil.;   

DOI  :  10.1590/S0100-40422006000100010

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

Unknown