A simple, rapid and sensitive ultraviolet-visible spectrophotometric technique for the determination of ultra-trace copper based on injection-ultrasound-assisted dispersive liquid-liquid microextraction
Ditiocarb - chemistry, Copper - analysis, Liquid Phase Microextraction - methods, Carbon Tetrachloride - chemistry, Spectrophotometry, Ultraviolet - methods, Rivers - chemistry, Spectrophotometry - instrumentation, Water - chemistry, Spectrophotometry - methods, Water Pollutants, Chemical - analysis, Spectrophotometry, Ultraviolet - instrumentation