The green chemistry method for analyzing changes in the concentration of substances during a reaction process is an energy-saving and interesting experimental process. In this paper, the performance of electrolysis of methylene blue (MB) in NaCl electrolyte was studied using a smartphone-based paper microzones method (PMZs), and paper microzone platform was made by discarded label stickers. The linear range spanned from 1.25 to 15 mg/L for the concentration-absorbance correspondence measured via spectrophotometry, and from 1.25 to 17.5 mg/L for the concentration--value correspondence measured via the PMZs method. The findings revealed that the limit of detection (LOD) value of the PMZs method was 0.494 mg/L, and the limit of quantification (LOQ) value was 1.497 mg/L. Moreover, the accuracy ranking of the measured MB electrolytic change process across different channels was as follows: Red>Grey>Green>Blue. PMZs method also showed well reliability in measuring actual dye polluted wastewater. The results demonstrate the sensitivity and precision of the PMZs method, as indicated by the low LOD and LOQ values. Additionally, the accuracy ranking provides valuable insight into the performance of the method across different color channels, shedding light on the potential applications and limitations of the PMZs technique in color-based electrochemical analyses. The electrolysis reaction led to a red-shift in the absorption characteristics of MB in NaCl electrolyte, resulting in a notable change in its light absorption properties. This information is crucial for researchers and practitioners seeking to employ the PMZs method for accurate and reliable color measurements in various scientific and industrial settings.

中文翻译：

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使用纸微区法以简单的方式评估电催化性能


分析反应过程中物质浓度变化的绿色化学方法是一种节能且有趣的实验过程。本文利用基于智能手机的纸微区法（PMZs）研究了亚甲基蓝（MB）在氯化钠电解液中的电解性能，并利用废弃的标签贴纸制作了纸微区平台。通过分光光度法测量的浓度-吸光度对应关系的线性范围为 1.25 至 15 mg/L，通过 PMZs 方法测量的浓度-值对应关系的线性范围为 1.25 至 17.5 mg/L。结果表明，PMZs方法的检测限（LOD）值为0.494 mg/L，定量限（LOQ）值为1.497 mg/L。此外，不同通道测量的MB电解变化过程的准确度排序如下：红色>灰色>绿色>蓝色。 PMZs 方法在测量实际染料污染废水中也表现出良好的可靠性。结果证明了 PMZs 方法的灵敏度和精度，如低 LOD 和 LOQ 值所示。此外，准确度排名还提供了对该方法在不同颜色通道上的性能的宝贵见解，揭示了 PMZ 技术在基于颜色的电化学分析中的潜在应用和局限性。电解反应导致MB在NaCl电解质中的吸收特性发生红移，导致其光吸收特性发生显着变化。这些信息对于寻求使用 PMZ 方法在各种科学和工业环境中进行准确可靠的颜色测量的研究人员和从业人员来说至关重要。