A biodegradable colorimetric film for rapid low-cost field determination of formaldehyde contamination by digital image colorimetry

Rapid, Wide-Range, and Low-Cost Determination of Formaldehyde Based on Porous Silica Gel Plate by Digital Image Colorimetry

“…The calibration equations, linearity, linear range, LOD, and LQD are summarized in Table 1. , | − | and ∆RGB vs. formaldehyde concentrations are all found to be linear in the low concentration range (0-50 mg L ), which is much wider than previously reported [12]. The good linearity ( 0.9892) means that all these curves can be used for the quantification of formaldehyde.…”

“…The blank-subtracted intensity of the blue component may be more suitable for the condition that the color of the samples can interfere with the observation of the colored products [17]. Figure 4c illustrates a good linear relationship between the intensity of blue component and formaldehyde concentration in the range of 0-50 mg L , as well as blank-subtracted intensity of blue component illustrated in Figure 4d, whose range is much wider than previously reported (0-25 mg L ) [12], showing a good performance in formaldehyde determination.…”

“…All these analytical methods show a good LOD ( 2.7 mg L ) and LQD ( 8.2 mg L ), which can be estimated to be about 0.7 mg kg and 2.0 mg kg in food respectively by using the reported method [12]. These analytical characteristics show a potential in sensitive detection of formaldehyde in food.…”

“…Based on the analysis of basic RGB values (Red Green Blue data) obtained from the digital images of colorimetric products, DIC has shown the advantages of low cost in fast and in-field quantitative determinations [9]. In brief, the images are taken from a digital camera, such as the built-in digital camera in a mobile phone [10] or digital single-lens reflex camera [11], and their RGB data will be analyzed by a color analysis program (e.g., Matlab and Adobe Photoshop) [12]. The individual RGB values can then be inspected in order to produce a calibration curve for the quantitative determination of the interested analyte.…”

Smartphone Coupled with a Paper-Based Colorimetric Device for Sensitive and Portable Mercury Ion Sensing

“…Recently, digital image-based colorimetry is receiving more attention as an alternative to the conventional methods, owing to its green, low-cost, portable and simple analytical procedure to analyze chemical compounds including metals [8][9][10][11], anions [12,13], organics [14,15], biochemical compounds [16,17] and medical applications [18][19][20]. The dynamic range of the digital image represented by red-green-blue or RGB color space (i.e., from 0 to 255), is much broader than conventional colorimetry or spectrophotometry methods (i.e., from 0 to 2.0 absorbance) providing the opportunity to improve the sensitivity of detection [8,18].…”