The measurements by lab-on-a-chip devices are very interesting regarding the reduction of reagents, time and cost. In this paper, we have described the construction and application of a new device based on colorimetric measurements using a smartphone camera and a microfluidic paper-based device (μPAD), both fixed in supports obtained through 3D printing, employing a polylactic acid filament. The μPAD was evaluated as a water quality index device by colorimetric monitoring of water hardness (Ca²⁺ and Mg²⁺), total phenols (catechol), and pH. Under optimized parameters, the proposed method presented a linear range between 20 and 560 mg L⁻¹ for Ca²⁺ and Mg²⁺(hardness), 0.20 to 16 mg L⁻¹ of catechol and pH from 4.7 to 12, and limits of detection of 0.083 mg L⁻¹, 0.124 mg L⁻¹ and 0.262, for water hardness, catechol, and pH, respectively. The proposed device was successfully applied for the quality monitoring of the distribution of water samples.

芯片实验室设备的测量在减少试剂，时间和成本方面非常有趣。在本文中，我们已经描述了基于比色测量的新设备的构建和应用，该设备使用智能手机相机和基于微流体纸的设备（μPAD）固定在通过3D打印获得的支持物上，并使用聚乳酸丝。通过比色监测水硬度（Ca ²⁺和Mg ²⁺），总酚（儿茶酚）和pH值，将μPAD评估为水质指标设备。在优化参数，所提出的方法给出20和560毫克的L之间的线性范围^-1为的Ca ²⁺和Mg ²⁺（硬度），0.20至16毫克的L ^-1的儿茶酚，pH从4.7到12，和检测的0.083毫克的L的范围^-1，0.124毫克的L ^-1和0.262，对于水的硬度，邻苯二酚，和pH值，分别。该装置已成功应用于水样分布的质量监测。