Digital imaging using conventional camera, mobile phone camera, or computer scanner can be a convenient and low-cost approach for the highly sensitive assessment of hexavalent chromium in natural and waste waters. An aliquot sample containing Cr(VI) is reacted with diphenylcarbazide to yield a characteristic violet color. Image analysis of the violet-colored product gave the red, green, and blue (RGB) intensities that are converted into ten uniform and non-uniform color spaces and two color difference parameters, which are used and compared here, for the first time, as analytical signaling tools for the assessment of hexavalent chromium. Many of the acquired signals displayed outstanding analytical performance and statistically surpassed the regularly used RGB signals and competed well with signals of a sophisticated Shimadzu 1650 PC spectrophotometer. The sensitivity and simplicity and low cost of this strategy make it an outstanding competitor for commercial hexavalent chromium analyzers and advanced spectrophotometers.

使用常规相机，移动电话相机或计算机扫描仪进行数字成像可以是一种便捷且低成本的方法，用于高度敏感地评估天然水和废水中的六价铬。将含有Cr（VI）的等分试样与二苯基咔嗪反应，产生特征性的紫色。紫色产品的图像分析给出了红色，绿色和蓝色（RGB）的强度，这些强度被转换为十个均匀和不均匀的色彩空间以及两个色差参数，并在此进行了首次比较。作为评估六价铬的分析信号工具。许多采集到的信号显示出出色的分析性能，并且在统计上超过了常规使用的RGB信号，并且与复杂的Shimadzu 1650 PC分光光度计的信号相竞争。这种策略的灵敏性，简单性和低成本使其成为商用六价铬分析仪和高级分光光度计的出色竞争对手。