Study On Determination Of Inorganic Water-soluble Ions And Organic Acids In Atomospheric Particulate Matter And Drinking Water By Ion Chromatography

In China,with the rapid industrialization,urbanization,and large energy consumption,the emissions of harmful substances in air,water,and soil are increasing.Atmospheric PM_2.5.5 pollution and drinking water safety problem pose a major threat to global public health and have become an urgent problem to be solved.Ion chromatography（IC）technology has developed rapidly since its manufacture in the 1970s.Because of its green environmental protection,simple pretreatment,unique selectivity,fast analysis speed,high sensitivity and good accuracy,it has been widely used in environmental monitoring,food,pharmaceutical,energy,chemical,semiconductor and other fields.Therefore,to establish a ion chromatography method for the monitoring of inorganic water-soluble ions and organic acids in the environment can not only provide data support for environmental protection,but also ensure human health.In the chapter 1,the research significance and current research status of the water-soluble inorganic ions and organic acids are introduced.The ion chromatography technology is described.At the same time,the purpose and main content of this paper are briefly reviewed.In the chapter 2,to establish a method for the detection of 13 water soluble ions(F^-、Cl^-、NO₂^-、Br^-、NO₃^-、PO₄^3-、SO₄^2-、Li⁺、Na⁺、NH₄⁺、Mg²⁺、K⁺、Ca²⁺)in PM_2.5.5 by ion chromatography（IC）.1/4 of sampled quartz membrane filter was extracted by ultrasonic assisted with water and filtered by 0.22μm filter and then analyzed by IC.The anions were tested with 4.0 mmol/L Na₂CO₃+1.7 mmol/L NaHCO₃ as eluent and the cations were tested with 7.4 mmol/L HNO₃ as eluent.The 13 anions showed good linearity in their linear ranges respectively,the correlation coefficients r were exceeded 0.9995,the limit of detection（LOD）were0.8μg/L⁵2.9μg/L,the relative standard deviations（RSD）were0.1%⁵.3%and the average recovery rates were 82.5%¹10.0%under the determination conditions.The method is simple,rapid,high sensitive,accurate and reliable,which is suitable for the analysis of 13 inorganic water-soluble ions in PM_2.5.In the chapter 3,a method was developed for the simultaneous determination four acids in PM_2.5.5 by ion chromatography（IC）.The formic acid,acetic acid,monochloroacetic acid and dichloroacetic acid were detected by inhibitory conductance detector and separated by Metrosep A Supp7 and A Supp5 Guard.The temperature of columns were 45℃and Na₂CO₃-NaHCO₃ as the mobile phase eluted within 15 minutes.The four organic acids showed good linearity in the range of 0.05 mg/L⁴0 mg/L and its correlation coefficients was between 0.9991⁰.9996,the LODs were 15.0μg/L³5.6μg/L,the relative standard deviations（RSD）were0.2%⁴.8%and the average recovery rates were 80.0%¹06.5%under the determination conditions.The method is simple to implement and suitable for the monitoring the low molecular weight organic acids in PM_2.5.In the chapter 4,a new method was developed for the simultaneous determination of six common anions(F^-、Cl^-、NO₂^-、NO₃^-、PO₄^3-、SO₄^2-)and three inorganic disinfection by-products（BrO₃^-、ClO₂^-、ClO₃^-）with a single injection in drinking water.In this strategy,Application of A Supp7column,carbonate system eluent,conductivity detector,Metrohm Suppressor Module（MSM）and Metrohm Carbon dioxide Suppressor（MCS）for continuous inhibition.9 anions completely detected in 21minutes.High linearity（r>0.999）was observed for all target analytes for each respective concentration range.The limit of detection ranging from0.16μg/L¹1.7μg/L.The method was applied for the anions detection in treated drinking water from the four waterworks.Chlorate was found in all the four waterworks and chlorite or bromate was not detected.Results showed the method is simple,rapid,high sensitive and practical,which can effectively monitor the changes in disinfection by-products and other inorganic pollutants in water.