主题：【已应助】请帮忙查几篇英文文献，谢谢

1、【标题】Flame atomic absorption spectrometric determination of cadmium(II) and lead(II) after their solid phase extraction as dibenzyldithiocarbamate chelates on Dowex Optipore V-493
【文献出处】Analytica Chimica Acta, Volume 578, Issue 2, 25 September 2006, Pages 213-219
【作者】Esra Melek, Mustafa Tuzen and Mustafa Soylak   
2、【标题】Copper(II)-8-hydroxquinoline coprecipitation system for preconcentration and separation of cobalt(II) and manganese(II) in real samples
【文献出处】Journal of Hazardous Materials, Volume 147, Issue 3, 25 August 2007, Pages 832-837
【作者】Mustafa Soylak, Betul Kaya and Mustafa Tuzen 
3、【标题】5-Chloro-2-hydroxyaniline–copper(II) coprecipitation system for preconcentration and separation of lead(II) and chromium(III) at trace levels
【文献出处】Journal of Hazardous Materials, Volume 158, Issue 1, 1 October 2008, Pages 137-141
M【作者】ustafa Tuzen, Demirhan Citak and Mustafa Soylak
4、【标题】Copper(II)–rubeanic acid coprecipitation system for separation–preconcentration of trace metal ions in environmental samples for their flame atomic absorption spectrometric determinations
【文献出处】Journal of Hazardous Materials, Volume 137, Issue 2, 21 September 2006, Pages 1035-1041
【作者】Mustafa Soylak and Nilgun D. Erdogan 
5、【标题】5-Chloro-2-hydroxyaniline–copper(II) coprecipitation system for preconcentration and separation of lead(II) and chromium(III) at trace levels
【文献出处】Journal of Hazardous Materials, Volume 158, Issue 1, 1 October 2008, Pages 137-141
【作者】Mustafa Tuzen, Demirhan Citak and Mustafa Soylak 
6、 【标题】Copper(II)-8-hydroxquinoline coprecipitation system for preconcentration and separation of cobalt(II) and manganese(II) in real samples
【文献出处】Journal of Hazardous Materials, Volume 147, Issue 3, 25 August 2007, Pages 832-837
【作者】Mustafa Soylak, Betul Kaya and Mustafa Tuzen