Determination of sodium sulfide based on electrochemiluminescence of rhodamine B at a SWNT modified glassy carbon electrode

作者：Liu Fengyu^*; Gao Yulong; Li Wei; Shao Jiantao; Meng Yang

来源：RSC Advances, 2014, 4(32): 16893-16898.

DOI：10.1039/c4ra01839g

Electrochemiluminescence (ECL) of rhodamine B (RhB) at a single-wall carbon nanotube (SWNT) modified glassy carbon (GC) electrode has been employed for the determination of sodium sulfide. A linear response (R=0.99) over a sodium sulfide concentration range of 1.0 x 10(-14) to 1.0 x 10(-10) mol L-1 and a detection limit of 1.0 x 10(-14) mol L-1 can be reached. Furthermore, RhB was covalently linked with SWNT and then modified onto a GC electrode surface to detect sodium sulfide. It was found that the detection limit can be further reduced to 1.0 x 10(-16) mol L-1 in the case of a RhB-hexamethylenediamine-SWNT modified GC electrode. This is much lower than other detection methods. The proposed method was applied to the determination of sodium sulfide added into deionized water; the recovery was quite satisfactory with good reproducibility and stability. All these results provide the possibility of developing a novel ECL detection method for sodium sulfide.

• 出版日期2014
• 单位大连理工大学