Novel Method of Analysis for the Determination of Residual Formaldehyde by High-Performance Liquid Chromatography

Figure 7

Blank (black line) and spiked sample (blue line) chromatograms at the proposed limit of 1000 μg/g, showing the retention time of 4-methylbenzenesulfonohydrazide (MBSH), the formaldehyde/MBSH derivative, and sample peaks.