Application of large molecular weight poly (4-styrenesulfonate) as a binding phase of the diffusive gradients in thin films technique

作者：Chen Hong; Liu Yu jing; Jiang Yu hua; Gu Jia Li; Sun Ting^*

来源：Desalination and Water Treatment, 2012, 50(1-3): 125-131.

DOI：10.1080/19443994.2012.708557

• Diffusive gradients in thin films
• Binding phase
• Poly (4-styrenesulfonate)
• Heavy metals

As the replacement of previously recommended poly (4-styrenesulfonate) (PSS) with M-w similar to 7 x 10(4) (PSS-7E4) for measuring metal ions by diffusive gradients in thin films (DGT), a relatively large molecular weight PSS with M-w similar to 1 x 10(6) (PSS-E6) was used as binding phase in the liquid-type DGT device (PSS-E6 DGT). The binding capacities of PSS-E6 DGT for metals and the stability constants of PSS-E6 with metals were also investigated. The heavy metal speciations measured by PSS-E6 DGT in spiked river water (Cu2+: 26.01 +/- 2.59%, Cd2+: 42.96 +/- 2.56%, Co2+: 16.41 +/- 1.66%, and Ni2+: 18.24 +/- 1.96%) and in spiked domestic wastewater (Cu2+: 10.35 +/- 1.29%, Cd2+: 20.31 +/- 1.25%, Co2+: 8.04 +/- 0.89%, and Ni2+: 8.86 +/- 0.98%) were consistent with those measured by PSS-7E4 DGT in spiked river water (Cu2+: 26.91 +/- 2.82%, Cd2+: 40.88 +/- 3.04%, Co2+: 14.83 +/- 1.84%, and Ni2+: 16.65 +/- 1.83%) and in spiked domestic wastewater(Cu2+: 9.76 +/- 1.17%, Cd2+: 19.36 +/- 1.49%, Co2+: 7.65 +/- 0.92%, and Ni2+: 7.83 +/- 1.03%), respectively. Compared with PSS-7E4, PSS-E6 was more suitable as binding phase in the DGT device for its lower pretreatment depletion rate, lower cost, and lower pollution.

• 出版日期2012
• 单位渤海大学; 东北大学