国产“双圈”牌滤纸吸力率定曲线研究

Research on calibration curves of home-made “Double Circle” filter papers

滤纸法是测量吸力的一种简单又经济的方法,国外已经有了大量关于Whatman No.42和Schleicher&Schuell No.589滤纸的研究,而国内关于国产"双圈"牌滤纸的研究还处于起步阶段.基于此,详细介绍了滤纸法测定吸力的基本原理,归纳了已有文献中关于3种国产"双圈"牌滤纸测定吸力的成果,在此基础上进行了再分析,提出了便于实际应用的新的吸力率定方程.结果表明:双线性方程能够较好拟合国产"双圈"牌滤纸的吸力率定曲线,同一种型号滤纸的基质吸力和总吸力率定曲线可以采用同一方程,新提出的吸力率定曲线涵盖更大范围的吸力;No.201型与No.203型滤纸吸力率定试验数据较多且结果比较一致,得到的吸力率定曲线可靠度较高,No.202型滤纸建议进一步试验以获得更加稳定的吸力率定曲线.

Filter paper technique is a simple and economic method to measure suction.Numerous researches have been conducted on Whatman No.42 and Schleicher Schuell No.589 filter papers,while limited studies have been focused on the home-made＂Double Circle＂filter paper.This paper introduces the principle of using filter paper technique to measure suction and categorized the test data of three types of homemade＂Double Circle＂filter papers from the literature.Based on analyzing the data,new calibration equations which are more applicable are raised.The results show that the bilinear equations can fit well the relationship between suction and the water content of＂Double Circle＂filter papers.Same equation can be used to calibrate both matric suction and total suction for same kind of filter paper.The new proposed equations cover a wider range of suction by combining more data.The test data of No.201 and No.203 filter papers are sufficient and consistent enough,thus the calibration curves are reliable.