2014中国汽车工程学会年会用户论文集：According to the national standard GB 29518-2003,the test results of the urea reductant are sampled,and a rapid test and evaluation method is developed.When the urea solution is clear,the transparent and invisible floating or suspended particles are visually inspected during the appearance inspection,the conductivity doesn't exceed 1000 uS/cm and the urea concentration is 31.8%-33.2%.and thus it is qualified.The rapid assessment result is efficient and perfectly consistent with the result of standard test in laboratory.质量调查尿素还原剂的车用SCR和快速评估方法的发展