The absorption spectra in the PCE methods with and without having a metal sample as well as the blank Answer that contains metal were recorded at place temperature using a UV-Vis spectrophotometer (Jasco design V-730, Tokyo, Japan). The spectra were measured during the vary from 200 to 800 nm. C. https://connerqsuuu.bloggazzo.com/27577682/the-basic-principles-of-2-fa-hcl