A laboratory study of the effects of acid rain on industrial waste and its impact on the physicochemical properties of groundwater
Column experiments were used to study the leaching of 4 samples of industrial waste and 5 soil samples by distilled water and by synthetic acid rain solutions /HNO3 and H2SO4 at pH 3/. The pH, the electrical conductivity, the total dissolved solids and the concentration of Al, Ca, Cl, Cr, Fe, K, Mg, Mn and Na have been measured in the resulting lixiviates. The pH of the water seems to have little effect on all these parameters but they are significantly influenced by the nature of the solid material.
Abstract Many human operations have created a large population of small orbital debris in near Earth environment. The threat they represent for satellites is a major factor for the preparation of future space missions. Several experiments devoted to the study of this environment, as well as various materials exposed to space, have been retrieved in the past few years. The analysis of the results shows some differences with previous modeling. Comparison with data from LDEF and from EURECA give some insight in the long term evolution of particle size distribution. Chemical identification of particle remnants inside craters is difficult but provides valuable information on the origin of the impactors. Permanent monitoring of environment is obviously needed, especially for the type of orbits where data are presently scarce ie. heliosynchronous and geostationary orbits.