Ngày tải lên :
05/09/2013, 09:08
... mixed thoroughly to achieve homogeneity and sieved through a 2-mm plastic sieve to remove gravel-sized materials, leaves and other particles prior to analyses of metal concentration and ignition ... mostly of silt and clay with less than 20% sand content However, the third sample contained 64% of sand and other upstream samples mostly consisted more than 97% of sand Lead and zinc concentrations ... G P., Marsland, E J., Tian, K., Zhang, B., Anderson, T A., Cox, S B., Abel, M T., Leftwich, B D., Huddleston, J R., Jeter, R M and Kendall, R J (2006) Assessment of pathogens and toxicants in...