Chromium Phytotoxicity Test of Metal Coating Wastewaters

Abstract

Metals are deformed by some mechanisms such as oxidation and corrosion. In order to protect metals from deformation and effect of some agents, metal coating method may be used. Hot galvanizing, thermal spraying, electroplating and sherardizing are some of these methods and they depend on the type of metal which will be coated to protect to metal materials. Zinc, nickel, brass, chrome, gold, cadmium, copper, brass, and silver are the main materials used for metal coating process. Chromium may be the most deteriorating one within these metals because it has negative impacts on both human and other livings. It is found in the environment in many forms and mined in different countries. Especially chromium +6 is considered as carcinogenic and may lead to health problems such as allergic reactions, nose irritations and nosebleed, stomach ulcer, weakened immune system, genetic material alteration, stomach ulcer, kidney and liver function disorders and death. Therefore, metal

coating wastewaters including high concentrations of chrome should be cleaned and treatment is necessary. In this study wastewater containing chrome produced by metal coating industry was analysed by using some plant species. In this study, the reaction of some plant species was investigated against different concentrations of chrome solution. Main plants used for the tests are Lepidium sativum and Lemna minor. Examining the negative effects of chrome which may harm plants and offering more accurate wastewater treatment techniques against chromium wastewater is possible with this method. There is significant relation between chromium concentration and toxic level on plant germination and growth rate. Moreover, variance analysis was applied to the results taken from experimental study in laboratory condition with selected level of chromium level and the significance importance was determined with our results.

Keywords

• Metal Industry Wastewaters,Chromium,Lemna minor,Phytotoxicity Test

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