Comparing campaigns with the same sampling depth

In 15 years, average contents of Zn, Cd, Ba and Pb have increased by 275%, 210%, 74% and 17%, respectively. Contents of these PHA-848125 elements have particularly increased to the N of the city, close to the Zn industry and the main routes of ore transport, and downwind from the industrial area. Thus, Zn concentrations in sample nos. 5, 16 and 1 have increased 14, 8 and 5 times, respectively in 15 years and concentrations of Zn and Cd in sample no.