geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Improved methods for selective dissolution of manganese oxides from soils and rocks


, : Improved methods for selective dissolution of manganese oxides from soils and rocks. European Journal of Soil Science 55(1): 47-54

Hydroxylamine hydrochloride (NH2OH-HCl) and hydrogen peroxide (H2O2) have been used in the past for selective dissolution of manganese oxide minerals. The methods reported, however, give poor recoveries. We tried to improve the methods in this respect. By stoichiometry, incomplete dissolution of Mn oxides is due to the lack of NH2OH-HCl added or to the lack of acid added in the case of H2O2 treatment. By increasing the amount of solution for a given amount of solid in the case of NH2OH-HCl and by increasing the acid concentration in the case of H2O2 treatment, we obtained rapid and complete dissolution of synthetic Mn oxides. The dissolution of natural samples, however, was slower than that of synthetic ones. Based on the results obtained, the improved methods are: (i) 0.1 M NH2OH-HCl, non-acidified, 2 hours' stirring, and 1 g solid in 2 litres solution; (ii) 30% H2O2 in 0.5 M nitric acid, 0.5 hours' stirring, and 1 g solid in 1 litre solution. The improved methods achieved almost complete release of manganese from samples without decreasing the selectivity of dissolution. Reprinted by permission of the publisher.

US$19.90

DOI: 10.1046/j.1351-0754.2003.0545.x


Other references

McNulty, S.E.; Gratch, D.; Costello, D.; Heropoulos, M.; Kim, J.Y., 1995: The effect of midazolam and lorazepam on postoperative recovery after cardiac surgery. Anesthesia and Analgesia 81(2): 404-407

Banerjee, A.C.oudhuri, M.; Ghosh, B., 1981: Changes in nucleotide content and histone phosphorylation of ageing rice seeds. Zeitschrift fur Pflanzenphysiologie = International journal of plant physiology02(1): 33-36

Bai, Y.; Sun, E.; Shi, Y.; Jiang, Y.; Chen, Y.; Liu, S.; Zhao, L.; Zhang, M.; Guo, H.; Zhang, H.; Mu, Z.; Ren, F., 2016: Complete genome sequence of Streptococcus thermophilus MN-BM-A01, a strain with high exopolysaccharides production. Streptococcus thermophilus MN-BM-A01 (ST MN-BM-A01) (CGMCC No. 11383) was a strain isolated from Yogurt Block in Gansu, China. The yogurt fermented with this strain has good flavor, acidity, and viscosity. Moreover, ST MN-BM-A01 could produce a hi...

van der Wegen, P.; Louwen, R.; Imam, A.M.; Buijs-Offerman, R.M.; Sinaasappel, M.; Grosveld, F.; Scholte, B.J., 2005: Successful treatment of UGT1A1 deficiency in a rat model of Crigler-Najjar disease by intravenous administration of a liver-specific lentiviral vector. Treatment of congenital and acquired liver disease is one of the main issues in the field of gene therapy. Self-inactivating lentiviral vectors have several potential advantages over alternative systems. We have constructed a self-inactivating len...

Chambers, L.; Sreedharan, S.K.; Deam, S.; Kalsheker, N.; Brocklehurst, K., 1997: Is the dust mite allergen Der p1 a cysteine proteinase?. Biochemical Society Transactions 25(1): 85s-85s

Larimer, F.W.; Mural, R.J.; Soper, T.S., 1990: Versatile protein engineering vectors for mutagenesis, expression and hybrid enzyme formation. Protein Engineering 3(3): 227-231

Hutchison, G.B., 1973: Progress report. Hodgkin's clinical trial, 1972. National Cancer Institute Monograph 36: 387-393

Horak, Peeter, 2003: When to pay the cost of reproduction? A brood size manipulation experiment in great tits (Parus major). Parental investment (PI) theory assumes that optimal parental investment is a function of expected cost/benefit ratio of current versus future reproduction. This study tests the prediction of PI theory that in a species with high adult mortality,...

Hartley, J., 1965: Coherence in Eucalyptus. The F2 progeny (251 three-year plants) of a hybrid between E. pulverulenta and E. grandis were examined for leaf shape, petiole length, degree of glaucousness, growth habit, development of internode, and girth, and values of the correlation coeffi...

Przetak, C., 1980: Rational periodontal therapy. Die Quintessenz 31(8): 179-188