Simple and excellent selective chemiluminescence-based CS2 on-line detection system for rapid analysis of sulfur-containing compounds in complex samples

Article abstract of DOI:10.1021/acs.analchem.5b00722

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 (CS₂). We found that the CL detection of CS₂ 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 CS₂ are SO₂ and CO₂. Significantly, this CL emission phenomenon has a wide application due to many sulfur-containing compounds that can convert to CS₂ under special conditions. On the basis of this scheme, a CS₂-generating and detection system was developed for rapid measurement of CS₂ or other compounds that can convert to CS₂. The usefulness of the system was demonstrated by measuring dithiocarbamate (DTC) pesticides (selected mancozeb as a representative analyte) based on the evolution of CS₂ in spiked agricultural products. Results showed that the system allows online and large volume detection of CS₂ under nonequilibrium condition, which greatly reduces the analytical time. The concentrations of mancozeb in the spiked samples were well-quantified with satisfied recoveries of 76.9-97.3%. 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 CS₂ and some other sulfur-containing compounds in complex samples.