In the Tuman-3 tokamak, the laser-induced fluorescence method is used for local measurements of the impurity atom (Fe, Ni) density in the plasma boundary region near the reference limiter section for different discharge conditions. The Ni impurity is shown to increase significantly during a minor disruption. The limiter surface sputtering rate is found to be strongly decreasing when the plasma column is torn off the limiter edge during magnetic compression. The sputtering rate decreases in spite of a substantial increase in energy containment. The contribution of the main sources to limiter surface sputtering during Ohmic heating and adiabatic plasma compression is explored. For a compressed plasma column, charge-exchange hydrogen neutrals are the most probable source of limiter sputtering.