Will paper microzones become the greenest chemistry method for electrolytic analysis?

[Display omitted] • Electrochemical properties were explored using smartphone photos. • The paper microzones method is accurate for high dye concentrations. • Using the paper microzones and smartphone to make experiments more green chemistry. • The spectrophotometric method is more adaptable than the paper microzones method. Methods of electrochemical correlation are becoming more complex and costly with the lack of a simple electrolytic analysis method. Herein, an interesting analysis of the performance of electrocatalytic degradation of different dyes was carried out using a modified paper microzones method (PMZs) performed with a smartphone, and data from spectrophotometers were used for comparative analysis. At the same voltage and in the same reaction cell, the same mass of sodium sulphate, acetic acid and pure water were added according to the strength of the electrolyte to degrade methyl orange(MO), fuchsin basic(FB), methylene blue(MB) and the mixture of these dyestuffs. When measured by the PMZs method, the correlation coefficients were above 0.9 in the concentration range of 5–50 mg/L, the range of variation of LOD values was 3.843–9.561 mg/L and the range of variation of LOQ was 11.646–28.973 mg/L. When measured by the spectrophotometric method, some of the dyes only had a greater correlation in the range of 5–40 mg/L. The range of variation of LOD values was 0.900–9.213 and the range of variation of LOQ was 2.727–27.917 mg/L. When FB was used as a degradation object, the decrease in absorbance at 80 min was 21.83%, 35.93%, 60.90% and the increase in grey value was 0.40%, 3.04%, 3.25% under the conditions of electrolytes only water, CH 3 COOH, Na 2 SO 4 , respectively, and maintained P less than 0.05 at different moments. Hence, the related results contribute to the further application and development of green chemistry PMZs in electrochemical analysis and environmental science. [ABSTRACT FROM AUTHOR]