6种保水剂吸水保水性能的比较

比较分析了6种保水剂在0～0.5 mol/L的NaCl、KCl、CaCl2电解质溶液,以及pH为2～12的蒸馏水中的吸水倍数和保水剂对土壤水分蒸发的影响.结果表明:随着3种电解质盐溶液浓度升高,保水剂吸水倍数呈下降趋势;CaCl2对保水剂吸水倍数的影响明显大于KCl和NaCl.在pH为6～8的蒸馏水中保水剂能保持较好的吸水性能;当pH≤4或pH≥10时吸水倍数明显下降,保水剂对酸性水溶液更为敏感.保水剂能有效地降低土壤水分蒸发速率.几种保水剂呈相似的变化趋势,其中"高能抗旱保水剂(GN)"表现最佳.以GN进行的土壤质地对保水剂保水效果影响的试验表明,壤土中保水剂对抑制土壤水分蒸发速率的效果较明显.

Comparative Analysis of Water Absorption and Retention to Six Super-absorbent-polymers

Water absorbability of six super-absorbent-polymers was compared in NaCl,KCl,CaCl2 solution with concentration ascending from 0 to 0.5 mol/L.The result concluded that following with the electrolyte concentration ascending,water absorbability had a decreasing trend.Water absorbability was measured and compared when the distilled water pH value changed from 2 to 12.It can be concluded that,when pH value between 6 to 8,super-absorbent-polymers can keep a more steady and better performance of absorbing water than pH value beyond the range of 4 to 10.Super-absorbent-polymers can affect the soil water evaporation rate,the more super-absorbent-polymers are used,the lower evaporation rate is.In all these experiment,GN had a best performance among the group.Soil characters can affect super-absorbent-polymers' role of decreasing soil water evaporation rate in the experiment with GN.In loam soil,the role was more obviously.