Simple and Excellent Selective Chemiluminescence-Based
CS<sub>2</sub> On-Line Detection System for Rapid Analysis of Sulfur-Containing
Compounds in Complex Samples
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Abstract
To
study the interesting chemical reaction phenomenon can greatly
contribute to the development of an innovative analytical method.
In this paper, a simple CL reaction cell was constructed to study
the chemiluminescence (CL) emission from the thermal oxidation of
carbon disulfide (CS<sub>2</sub>). We found that the CL detection
of CS<sub>2</sub> exhibits unique characteristics of excellent selectivity
and rapid response capacity. Experimental investigations together
with theoretical calculation were performed to study the mechanism
behind the CL reaction. The results revealed that the main luminous
intermediates generated during the thermal degradation of CS<sub>2</sub> are SO<sub>2</sub>* and CO<sub>2</sub>*. Significantly, this CL
emission phenomenon has a wide application due to many sulfur-containing
compounds that can convert to CS<sub>2</sub> under special conditions.
On the basis of this scheme, a CS<sub>2</sub>-generating and detection
system was developed for rapid measurement of CS<sub>2</sub> or other
compounds that can convert to CS<sub>2</sub>. The usefulness of the
system was demonstrated by measuring dithiocarbamate (DTC) pesticides
(selected mancozeb as a representative analyte) based on the evolution
of CS<sub>2</sub> in spiked agricultural products. Results showed
that the system allows online and large volume detection of CS<sub>2</sub> under nonequilibrium condition, which greatly reduces the
analytical time. The concentrations of mancozeb in the spiked samples
were well-quantified with satisfied recoveries of 76.9β97.3%.
The system not only addresses the urgent need for rapid in-field screening
of DTC residues in foodstuffs but also opens a new opportunity for
the fast, convenient, and cost-effective detection of CS<sub>2</sub> and some other sulfur-containing compounds in complex samples