▎ 摘　　要

NOVELTY - A point-of-care testing (POCT)-type chemical oxygen demand (COD) detection system comprises a graphene oxide-nano-nickel particle modified planar electrode, and a thin layer flow cell. USE - POCT-type COD detection system. ADVANTAGE - The POCT-type COD detection system is convenient and easy to operate, has high sensitivity and good repeatability; does not contain any expensive and toxic reagents; and avoids secondary pollution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for detecting the POCT-type COD detection system based on graphene oxide-nano-nickel particle-modified planar electrode.