DIAGNOSIS OF PRESENCE OF CROCOITE IN YELLOW PAINTS AND SOILS IN PLAYGROUNDS OF HERMOSILLO, SONORA, MEXICO

The enviromental destination of minerals utilized in man made products has not been well explored, so the efect that they can cause in ecosystems and human health is not well known. An example of this is the use of crocoite as a pigment that is added in different types of paint. This study consists of 15 samples recolected in different parks of the city. To colect the sample we used a razor to scrape the equipament surface and obtain sheets of paint that we stored in polyethylene bags. For the sampling of superficial soil, we took the specifications of the NOM-132. The soil sample is composed and taked in tresbolillo 5 individual points in a grid of 1m2, later, the same weight was mixed to represent the grid.

This study is focused in parks because they represent an exposition place for vulnerable population (kids) and to this date, in Mexico there are no normatives in terms of the painting used in these sites. Results show very high values of Pb (maximum 173,136.13 mg/Kg) and chrome (maximum 23,346.01 mg/Kg). The values of both metals are way above the international regulations and in Mexico, it does not exist a regulation that indicates a normative concentration, only for paint in toys (NOM-003-SSA1-2006). These results show that the parks do not have a strong impact of Pb and Cr respect to the geochemical background of the soils. The high concentrations of lead can have adverse effects in kids health exposed, such as affectations in the central nervous system, brain, circulatory system, kidneys and skeleton.