土壤与地下水污染防治(soilandgroundwaterpollution课件.ppt
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- 土壤 地下水 污染 防治 soilandgroundwaterpollution 课件
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1、國立高雄第一科技大學環境與安全衛生工程系1 Colorimetric test Kits Fiber Optic Chemical Sensors Gas Chromatography Graphite Furnace Atomic Absorption Spectroscopy Immunoassay Infrared Spectroscopy Laser-Induced Fluorescence Mass Spectrometry X-Ray FluorescenceField characterization technologies土壤與地下水污染防治土壤與地下水污染防治(Soil a
2、nd Groundwater Pollution Control)Source:http:/www.epa.gov/ord/SITE/國立高雄第一科技大學環境與安全衛生工程系2Colorimetric test Kits Test kits are self-contained analytical kits that use a chemical reaction that produces color to identify contaminants,both qualitatively and quantitatively.Wide applications-from simple co
3、lorimetric indicator tubes for health and safety monitoring to quantitative testing for definitive site characterization.Also,after the initial site characterization phase to monitor the operating conditions of a remediation system or to confirm that contaminated soils have been removed.國立高雄第一科技大學環境
4、與安全衛生工程系3Advantages Speed Portability Ease of use Low cost per sample國立高雄第一科技大學環境與安全衛生工程系4Some innovative technologiesKit nameContaminatesMedium matrix Range and DL*The Hanby field test kitPetroleum and constituents(gasoline,diesel fuel,jet fuel,crude oil,BTEX,PAHs,PCBsWater and soilSoil 1-1000 mg/k
5、gWater 0.1-20 mg/LThe Clor-N-Oil and Clor-N-Soil KitsPCBsOil,soil,or surface wipe samplesClor-N-Oil kit at 20,50,100,or 500 ppm Aroclor 1242Clor-N-Soil kit at 50 ppm Aroclor 1242The PetroFLAGGasoline,diesel fuel,jet fuel,fuel oil,motor oil,transformer oil,hydraulic fluid,greases,and many other types
6、 of hydrocarbonssoilCommon 20-2000 ppmJet fuel 200-2000 ppmWeathered gasoline 400-2000 ppmThe AccuSensorTCE,total THM(chloroform,bromodichloromethane,chlorodibromomethane,bromoform),BTEX,and PCEWaterTCE 5ppbTHM 10 ppbThe Envifrol Quick Test PCP,TNT,PAHsSoil or water(PCP only)PCP 1.5-90 ppmTNT 3-100
7、ppmPAHs 1-3000 ppmDL=detection limits國立高雄第一科技大學環境與安全衛生工程系5MoreKit nameCosts,US$LimitationsThe deviceThe Hanby field test kit$17/testNot capable of distinguishing different hydrocarbon fractions in mixture samplesThe Clor-N-Oil and Clor-N-Soil KitsNot availableFalse positive due to other chlorinated
8、organicsThe PetroFLAG$10-15/testFalse positive due to natural occurring waxes and oil;good for known hydrocarbonsThe AccuSensor$35/testChloroform would result in the TCE measurement error up to 40%The Envirol Quick Test$40/testTCP,TeCP can interference the results國立高雄第一科技大學環境與安全衛生工程系6Mode of operati
9、on I Hanby Field test kit(petroleum)weighing five grams of soil sample,placing it into a beaker,adding an ampoule of solvent to the soil,and stirring the sample for approximately two minutes to extract the contaminant.The extract then is poured from the beaker into a marked test tube,and the catalys
10、t is added to the test tube.The mixture is shaken for two minutes while the color change develops.The developed color of the precipitate is compared with a calibration photograph to obtain quantitative results.The water test is performed in the same manner,with the exception that a 500-milliliter(ml
11、)water sample is extracted with solvent in a 500 ml separatory funnel,which is included in the water test kit.The procedure takes approximately 10 minutes Dexsil Clor-N-Oil and Clor-N-Soil kit(PCBs)Several grams of sample are introduced into a vial that contains an ampoule of organic solvent,and the
12、 PCBs are extracted from the sample medium with the solvent.The extract is treated with metallic sodium to strip chlorine from the biphenyl compound as chloride ions.An acidic buffer is added to the extract to quench any unreacted sodium and to transfer the chloride ions into the aqueous phase.Final
13、ly,chloride ions are measured colorimetrically by an indicator solution that creates a purple or yellow color depending on the presence of chloride ions.The purple color indicates the absence of chloride,and therefore the absence of PCBs,in the sample.A yellow or clear color indicates the presence o
14、f chloride,and therefore the presence of PCBs,in the sample.The procedure takes approximately 10 to 15 minutes.國立高雄第一科技大學環境與安全衛生工程系7Example-Hanby kit in screening TPHs in soil 國立高雄第一科技大學環境與安全衛生工程系8Mode of operation II PetroFLAG(hydrocarbons)weighing 10 grams of soil by an electronic balance,placing
15、the soil sample in a test tube,adding extraction solvent to the tube,shaking the tube intermittently for four minutes,filtering the extract into a vial that contains development solution,and allowing the solution to react for 10 minutes.The filtration step is important because the analyzer measures
16、the turbidity or optical density of the final solution.Approximately 25 samples can be analyzed per hour.The vial of developed solution is placed in the meter,and the instrument produces a quantitative reading that reveals the concentration of hydrocarbons in the soil sample.AccuSensor(TCE/THM)a wat
17、er sample is poured into a standard 40-ml volatile organic analysis(VOA)vial with an AccuSensor cap that has a Teflon membrane.The vial is shaken for 30 seconds to allow volatile compounds to partition into the headspace of the vial and reach equilibrium.The vial is inserted cap-first into the meter
18、,exposing the gas phase in the headspace to the porous Teflon membrane.The volatile analytes in the headspace permeate the membrane and then encounter the reagent.The degree of absorbency is measured and the concentration is displayed in parts per billion(ppb).The concentration in the headspace,diff
19、usion rate of the analyte,and reaction kinetics all are dependent on temperature.The AccuSensor meter incorporates a thermistor and software that provide automatic temperature compensation within an operating range of 0 to 50 degrees Centigrade.The procedure takes approximately five minutes.國立高雄第一科技
20、大學環境與安全衛生工程系9Mode of operation III Envirol Quick Test(PCP)The Envirol Quick Test uses a photochemical reaction to produce a color proportional to the concentration of the analyte of interest.A small portable photometer called the Envirometer is used to measure the reaction.Three standards provided w
21、ith each test kit are used to calibrate the Envirometer.The standard curve for the photochemical reaction is stored electronically in the unit.A calibration verification solution,also provided with each test kit,is used to verify the calibration curve.A soil sample is weighed,extracted with a solven
22、t,and then filtered.The single analyte test system entails using an organic solvent to extract the analytes from soil and employs various combinations of solid phase extraction(SPE),liquid-liquid extraction,and acid-base cleanup techniques to separate the analytes into an organic solvent.The extract
23、ion procedure used varies according to the specific test to be performed.Filtration helps to reduce interferences.The sample is placed in the Envirometer and the degree of absorbency of the sample is measured and converted into a concentration of PCP,trinitrotoluene(TNT),or carcinogenic PAHs.The ent
24、ire extraction and analysis procedure requires approximately 20 to 30 minutes.國立高雄第一科技大學環境與安全衛生工程系10Fiber Optic Chemical Sensors(FOCS)國立高雄第一科技大學環境與安全衛生工程系11Typical usages FOCS have primarily been developed to measure volatile petroleum constituents such as BTEX and chlorinated VOCs such as TCE,PCE,a
25、nd carbon tetrachloride in water,air,or soil gas.The sensors have been developed to be placed down monitoring wells to provide in situ measurements of VOC concentrations in groundwater.FOCS typically measure total VOC concentrations and are not capable of distinguishing individual volatile organic c
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