http://reply.papertrans.cn/3/284/28385/28385-31.png
http://reply.papertrans.cn/3/284/28385/28385-32.png
http://reply.papertrans.cn/3/284/28385/28385-33.png
Submitted on: 22 July 2013.
Revised on: 14 August 2013.
Accepted on: 30 August 2013.
SOUTH AFRICAN JOURNAL OF CHEMISTRY-SUID-AFRIKAANSE TYDSKRIF VIR CHEMIE
http://reply.papertrans.cn/3/284/28385/28385-35.png
http://reply.papertrans.cn/3/284/28385/28385-36.png