Determination of Lead, Cadmium, Copper and Iron Contents in Water by Multi-walled Carbon Nanotubes-solid Phase Extraction

Na SUN; Xiao-feng CHI; Feng-zu HU; Yue-qin YANG

2014 Vol. 33, No. 4

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Article navigation > Rock and Mineral Analysis > 2014 > 33(4): 545-550

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Na SUN, Xiao-feng CHI, Feng-zu HU, Yue-qin YANG. Determination of Lead, Cadmium, Copper and Iron Contents in Water by Multi-walled Carbon Nanotubes-solid Phase Extraction[J]. Rock and Mineral Analysis, 2014, 33(4): 545-550.

Citation:

Determination of Lead, Cadmium, Copper and Iron Contents in Water by Multi-walled Carbon Nanotubes-solid Phase Extraction

1.
Institute of Qinghai Province Product Quality Supervision and Inspection, Xining 810008, China
2.
Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
3.
Henan University of Science and Technology, Luoyang 471003, China

More Information

Corresponding author: Yue-qin YANG, xfchi@nwipb.ac.cn

Received Date: 31 October 2013

Revised Date: 29 November 2013

Accepted Date: 26 April 2014

Abstract

Abstract

The traditional solid phase extraction sorbent contains certain deficiencies in the progress of processing heavy metals in environmental samples, such as pH instability and co-extraction difficulty. Therefore, it is particularly important to find more efficient sorbents. A solid-phase extraction method using multi-walled carbon nanotube as absorbent materials for Pb, Cd, Cu and Fe in water has been determined. The effects of solution pH, elution solution, sample volume and matrix effects were investigated. Pb and Cd were determined by Graphite Furnace Atomic Absorption Spectrometry; alternatively, Cu and Fe were determined by inductively coupled plasma atomic emission spectrometry. Experimental results show that the extraction of the metal elements is most efficient when the pH value is 9.0 and flow rate is 2 mL/min with 1 mol/L HNO₃ as the elution solution by using the unmodified multi-walled carbon nanotube (outer diameter <8 nm). The maximum adsorption capacities of multi-walled carbon nanotube for Pb, Cd, Cu and Fe are 44.91, 42.31, 54.68 and 49.07 mg/g, respectively. K⁺, Na⁺, Ca²⁺, Mg²⁺, benzene and toluene have little effect on Pb, Cd, Cu and Fe extraction. The recoveries of Pb, Cd, Cu and Fe were 95.3%-99.5%, and RSD values (n=7) were 1.2%-3.2%, respectively. Compared with the traditional extraction method, this new method not only has high recovery and enrichment effect, but also is simple and accurate, which can be used in the detection of Cd, Cu, Fe and Pb in environmental water samples.
- water samples /
- Pb /
- Cd /
- Cu /
- Fe /
- solid phase extraction /
- multi-walled carbon nanotubes

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References

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