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Effect of low electrolyte concentration on hydraulic conductivity of clay-sand-hydroxy polymers systems


, : Effect of low electrolyte concentration on hydraulic conductivity of clay-sand-hydroxy polymers systems. Soil Science Society of America journal 53(2): 349-355

Iron and Al oxides are ubiquitous in soils and have profound affects on soil structure. The objectives of this study were to (i) determine the effect of Fe- or Al-polymers on saturated hydraulic conductivity (HC) of smectite-sand mixtures at different percentages of the clay cation exchange capacity (CEC) at different sodium adsorption ratios (SAR) and solution electrical conductance (EC), and (ii) determine the reason for the observed effect. The HC of 5% smectite, 95% acid washed quartz sand (0.1 to 0.5-mm diam.) with and without polymer additions was determined by leaching with SAR 5, 10, or 20 and EC 500, 100, 50, 10, 5, 3, 2, 1 solutions, and distilled water (DW) at pH 7.5. The HC of clay leached with SAR 5 solution decreased with a reduction in solution concentration from 500 to 1 mol(c)m-3, after which clay was leached from the system and HC increased. No clay was leached from the column in the presence of hydroxy-Al polymers in excess of 25% of clay CEC. Little HC reduction occurred at SAR 10 in the presence of hydroxy-Al polymers. At SAR 20, HC of the clay-sand mixtures decreased greatly, but no clay was observed in the leachate. Hydroxy-Fe polymers produced similar effects, but to a lesser extent. The presence of hydroxy-Fe polymers equivalent to 50% of CEC was insufficient to prevent clay dispersion and removal from the column when SAR 5 solution of 1 mol(c)m-3 was replaced by DW. At 100% of CEC, Fe prevented clay dispersion when leached with SAR 5, 10, and 20 solutions. Iron was not as effective as Al-polymers in preventing reduction of HC at SAR 10. The Al-polymers appeared to be more effective than the Fe-polymers because they bound clay particles into larger stable microaggregates than did the Fe-polymers. A smaller percent of particles less than 2 micromoles was measured in the Al-treated clay than the Fe-treated clay. Both treatments increased the size of stable microaggregates compared to the untreated clay.

US$19.90

DOI: 10.2136/sssaj1989.03615995005300020006x


Other references

Graham, H.A.; Williams, A.N., 1980: A genetic model for the inheritance of the P, P1 and Pk antigens. A new genetic model of the P blood group system is presented. The system is controlled by two chromosomal loci. The first locus has three allelic genes. The pk gene codes for an alpha galactosyl transferase that converts ceramide dihexoside to cer...

Bednash, G.D., 1994: The future of nursing and health care reform. Imprint 41(4): 83-85

Espinosa, A.; Pijut, P.; Michler, C., 2006: Adventitious shoot regeneration and rooting of Prunus serotina in vitro cultures. A complete regeneration protocol was developed for Prunus serotina Ehrh., an important hardwood species for timber and sawlog production in the central and eastern United States. Nodal sections were cultured on Murashige and Skoog (MS) medium supp...

Huber R., 1979: Proteins synthesized in tobacco mosaic virus infected protoplasts. Cowpea and tobacco protoplasts (Vigna unguiculata and Nicotiana tabacum, respectively) were used to study the role of proteins in tobacco mosaic virus (TMV) multiplication. Proteins were analyzed by sodium dodecyl sulfate polyacrylamide slabgel el...

Derr, R.F.; Larkin, E.C.; Rao, G.A., 1988: Is malnutrition necessary for the development of alcoholic fatty liver in the rat?. Ingestion of various liquid diets containing 36% calories as ethanol and 35% calories as fat does not provide adequate nutrition to young growing rats. Studies conducted with the aforementioned diets have the effects of malnutrition confounded wit...

Vintermyr, O.K.; Iversen, O.; Thoresen, S.; Quint, W.; Molijn, A.; de Souza, S.; Rosillon, D.; Holl, K., 2014: Recurrent high-grade cervical lesion after primary conization is associated with persistent human papillomavirus infection in Norway. This retrospective registry-based study aimed to assess the human papillomavirus (HPV)-type distribution in primary and recurrent high-grade cervical intraepithelial neoplasia (CIN2+), and to discriminate pre-existing from newly-acquired infection...

Rattan, S.; Goyal, R.K., 1978: Effects of histamine on the lower esophageal sphincter in vivo: evidence for action at three different sites. Journal of Pharmacology and Experimental Therapeutics 204(2): 334-342

Kaaya, G.P.; Mwangi, E.N.; Malonza, M.M., 1995: Acaricidal activity of Margaritaria discoidea plant extracts against the ticks Rhipicephalus appendiculatus and Amblyomma variegatum. A water soluble extract of M. discoidea, an African indigenous plant induced high mortalities in nymphs of both Rhipicephalus appendiculatus, and Amblyomma variegatum and in adult R. appendiculatus, but not in adult A. variegatum. An oil hexane ex...

Persico, M.; Romano, M., 1993: Alanine aminotransferase measurements and histological disease in hepatitis C. Lancet 342(8883): 1369-1370

Ostrer, B.S., 2004: Leprosy: Medical views of leviticus rabba. This article discusses chapters 15 and 16 of the ancient midrash (allegorical commentary) Leviticus Rabba (IV -V AD) and its view of leprosy. The phenomenon of Biblical leprosy is here not investigated from a paleo-pathological point of view. The...