The absorption spectra from the PCE methods with and with out a steel sample in addition to the blank solution containing metal ended up recorded at area temperature employing a UV-Vis spectrophotometer (Jasco model V-730, Tokyo, Japan). The spectra were measured while in the range between two hundred to 800 https://2-fahcl71468.qowap.com/88923119/little-known-facts-about-2-fa-hcl