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Activity measurements of Ni 2+ in soils
Author(s) -
Aboulroos Samir A.,
ElFalaky Assia A.,
Lindsay Willard L.
Publication year - 1996
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.1996.3581590414
Subject(s) - solubility , soil water , nickel , chemistry , phase (matter) , mineral , analytical chemistry (journal) , mineralogy , environmental chemistry , geology , soil science , organic chemistry
Nickel activities were measured in 11 alkaline and slightly acidic soils using the chelate method. The measured activities ranged from 10 −6.82 to 10 −8.78 M and were inversely related to the pH of the soils. The measured Ni 2+ activities in the 11 soils could be predicted using the following expression: (Ni 2+ ) = 10 6.95 (H + ) 2 . The solubility of Ni was plotted on a log (Ni 2+ ) vs. pH solubility diagram for various Ni solid phase compounds. It is most likely that NiFe 2 O 4 (trevorite) is the solid phase controlling Ni solubility in these soils. Identification of the presence of this mineral needs further investigation.