9HOLDEN N M.Paper test-strip for rapid determination of nitrate tracer[J].Commum Soil Sci Plant Anal,1995,26:1885-1994.
10WATERS L C,COUNTS R W,PALAUSKY A,et al.Colorimetric strip tests:a comparison of visual and reflectometric measurements for quantitative applications[J].J Hazard Mater,1995,43:1-12.