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We report a paper-based chemosensor array device (PCSAD) for the quantitative detection of oxyanions including the herbicide glyphosate (GlyP) in aqueous media. The mechanism of the oxyanion detection relies on a coordination-binding-based sensor array. In this study, the competitive coordination binding among Zn2+, four catechol dyes, and seven oxyanions caused noticeable colour changes. The colour changes were employed for qualitative and quantitative analyses using an in-house automated image-processing algorithm with pattern recognition for digital images. A linear discrimination analysis discerned similarly structured oxyanions with 100% accuracy. The regression analysis allowed the accurate quantification of GlyP in the herbicide products with a limit of detection of 16 mg/L, which is lower than the health advisory value for children (20 mg/L) stipulated by the environmental protection agency (EPA). PCSAD is a powerful sensor device for the on-site quantification of aqueous anions for environmental assessment. [ABSTRACT FROM AUTHOR]

The Cover Feature shows a printed paper‐based colorimetric chemosensor array for multi‐anion detection. The device shows various color changes upon the addition of target anions such as the herbicide glyphosate. Common office equipment is used for fabrication and recording: an inkjet printer is employed to produce the chemosensor array, and a flatbed scanner rapidly captures a digital image of the sensing results. This system is a promising platform for on‐site qualitative and quantitative analysis of multiple analytes. More information can be found in the Communication by T. Minami and co‐workers. [ABSTRACT FROM AUTHOR]