The invention belongs to the technical field of
analytical chemistry, and specifically relates to a slide or test paper array for detecting liquid
calcium ions and a preparation method and application method of the slide or test paper array. The slide or test paper array is slides or test paper soaked with concentrated
sulfuric acid, hexadecyltrimethoxysilane and isopropanol. The
mass percentage of concentrated
sulfuric acid, hexadecyltrimethoxysilane and isopropanol is 0.1-3%, 3-18% and 80-96.9%. During use, an APS-CCA solution is added dropwise and taken as a colorimetric probe, wherein the
mass percentage of APS in the solution is 0.1-20%, and the concentration of CCA is 0.1-25 mmol / L, and a lattice array of a colorimetric probe solution is formed. The slide or test paper array is fast, simple and visualized, is convenient to carry, and can be used for on-site detection. The array has high
throughput, and can detect multiple samples at the same time. The array is excellent in hydrophobic performance, so that cross
contamination between to-be-detected samples is greatly reduced. The array is simple and easily-controlled in preparation process, has excellent selectivity of
calcium ions, and is high in detection accuracy.