calcium cobalt method 钙钴法

chromium-cobalt method 铬钴比色法

platinum-cobalt method 铂钴比色法

cobalt paper method 钴纸试法

cobalt nitrate method 硝酸钴法

cobalt chloride method 氯化钴测定法

platinum cobalt color method 铂钴比色法

cobalt thiocyanate ammonium color-developing method 硫氰酸钴铵法

Cobalt Chloride Test Paper method 氯化钴试纸法