2024-03-28T17:54:47Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/959432016-02-17T23:04:31Zcom_10261_47com_10261_8col_10261_300
Cobelo-García, A.
Santos-Echeandía, Juan
López-Sánchez, Daniel E.
Almécija, Clara
Omanovic, Dario
2014-04-28T10:44:56Z
2014-04-28T10:44:56Z
2014
Analytical Chemistry 86(5): 2308-2313 (2014)
0003-2700
http://hdl.handle.net/10261/95943
10.1021/ac403558y
1520-6882
The determination of trace elements using stripping voltammetry may be seriously affected by the presence of intensive matrix background or interfering peaks, leading to poorer detection limits and/or inaccurate quantitative results. In this work, we have tested the use of signal transformation (e.g., second derivative) in the analysis of platinum in seawater and sediment digests by means of catalytic adsorptive stripping voltammetry. In natural waters, the limit of detection of Pt is affected by a broad background wave due to the formazone complex used in the sample matrix for its determination, while in sediment digests, the Pt peak may be interfered with due to the presence of elevated concentrations of Zn, affecting the accuracy of the determination. Results applying second derivative signal transformation revealed a significant improvement (2–3-fold) of the detection limit in water due to the minimization of background effects, therefore allowing shorter accumulation times and faster determinations. In the presence of interfering peaks, the inaccuracy resulting from erroneous baseline selection in the original signal is eliminated when the second derivative is used. Signal processing should be considered as a useful tool for other voltammetric methodologies where more accurate or faster determinations are needed.
eng
openAccess
Improving the voltammetric quantification of ill-defined peaks using second derivative signal transformation: Example of the determination of platinum in water and sediments
artículo