نتایج جستجو برای: trivalent chromium
تعداد نتایج: 26790 فیلتر نتایج به سال:
During the tanning step, 30–40% of trivalent chromium remains in solid and liquid wastes, generating highly polluted sewage. In this study, powdered marble was used as a low-cost adsorbent to remove from synthetic solution real effluent. Batch adsorption experiments on were performed. After incubation, samples filtered uptake determined. A 3-level Box-Behnken Design study combined effect initia...
introduction: in electroplating processes, hexavalent chromium mist is emitted in air. hexavalent chromium mist can cause lung cancer and nasal septum in workers. as permissible exposure limit (pel) of hexavalent chromium is low (0.5 µg/m 3 ) and it is used in various industries, evaluation of workers exposure to hexavalent chromium is very important. however, hexavalent chromium is relatively ...
Hard chromium coatings have demonstrated their performance for several decades, particularly wear and corrosion resistance properties. However, the traditional process using trioxide (CrO3) is very toxic intended to disappear in European Union by 2024, thanks REACH regulation. This study aimed determine residual stress of amorphous deposits elaborated from baths containing trivalent ions. struc...
OBJECTIVES To determine whether occupational exposure to chromite, trivalent chromium, or hexavalent chromium causes respiratory diseases, an excess of respiratory symptoms, a decrease in pulmonary function, or signs of pneumoconiosis among workers in an integrated chain of stainless steel production. METHODS This cross sectional study was carried out in 1993 and the inclusion criterion was a...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید