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

Quimica nova

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

[1] Centro de Tecnologia Mineral, Rio de Janeiro

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 extractionprocedures are described for the determination of exchangeable and fixed ammonium,nitrate + nitrite, total exchangeable nitrogen and total nitrogen in certifiedreference soils and petroleum reservoir rock samples by steam distillation andindophenol method. After improvement of the original distillation system, anincrease 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 ofpublished procedures.

【 授权许可】

CC BY