trace analysis in a wide variety of samples application bulletins of metrohm s approximately 200 application bulletins 50 refer to polarography and voltammetry the examples listed here substantiate the versatility of the polarographic and voltammetric methods for a range of applications including both inorganic and organic substances application bulletin no application bulletin no water wastewater environmental protection aluminum in water samples 131 ammonium and nitrite in water samples 127 copper cobalt nickel zinc and iron in foods and water samples 114 iron and manganese in water samples ...