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CHEMICAL OXYGEN DEMAND (COD) CHEMICAL OXYGEN DEMAND - COD REAGENTS Reagecon offer reagents for the two accepted methods for measuring COD at concentrations of less than 400mg/l. Where the concentration is greater than 400mg/l, dilute the sample. Product No. Description pack Size WTR50W COD Reagent (1977 method) 2.5L WTR49W Modified COD Reagent (1986 method) Mercury free 2.5L ADDITIONAL REAGENTS ARE AS FOLLOWS: Product No. Description pack Size CODMS 20% w/v Mercury (II) Sulphate in 10% w/v Sulphuric Acid 500ml KC2002F 0.0208M (0.125N) Potassium Dichromate 1L AGN01001 Silver Nitrate Solution 1000g/l 100ml AGS1W 1% w/v Silver Sulphate in Sulphuric Acid 2.5L COD200 COD Calibration Standard 200mg/l Solution 500ml COD600 COD Calibration Standard 600mg/l Solution 500ml COD1300 COD Calibration Standard 1300mg/l Solution 500ml PFS1 Ferroin Indicator 100ml METHODOLOGY Methodology as per the Department of the Environment (U.K.) “Chemical Oxygen Demand (Dichromate Value) of Polluted and Waste Waters” published in 1977 and revised in 1986. 1977 METHOD 1. Pipette 10ml of sample (or diluted sample) into a 150ml boiling flask containing clean washed anti- bumping granules. 2. Add, by pipette, 1ml of 20% Mercury (II) sulphate (CODMS), mix well. 3. Add 18.5ml of COD reagent (WTR50W), mix well. 4. Fit the condenser and boil gently, under reflux, for 2 hours + 10 minutes. 5. Cool and add 25ml of distilled water via the condenser. 6. Disconnect the flask, cool to 25°C under running water, add 1-2 drops of Ferroin indicator (PFS1) and titrate excess Potassium dichromate with the standardised Ammonium Iron (II) sulphate (AF20251). End point is indicated by a change from blue/green to orange. Carry out a blank determination on all reagents replacing the sample with 10ml of distilled water. 1986 METHOD As per the 1977 method but with the following changes: Step 2. Step 3. Add, by pipette, 0.6ml of 1,000g/l Silver nitrate solution (AGN01001), 0.4ml of distilled water, mix well and leave to stand for 2 minutes. Add 18.5ml of modified COD reagent (WTR49W) 50 Reagecon - Delivering the correct result www.reagecon.com
COD VIALS & COD STANDARDS COD Reagent Vials As well as being compatible with the PC Compact COD Vario, Reagecon’s COD Reagent Vials can also be used in conjunction with the Aqualytic PC Spectro and all Hach TM spectrophotometers. This compatibility is proven in the Reagecon Technical Publication, “A comparative study of the performance of Reagecon COD vials and Hach TM COD vials” – available in the Technical section of Reagecon’s website – www.reagecon.com. Reagecon supply COD Reagent Vials and also offer a collection and disposal service for used vials that complies with all relevant dangerous goods disposal and environmental regulations. COD REAGENT VIALS - ORDERING INFORMATION Cat No. description pack Size 420720 COD Reagent Vials Measuring Range 0-150mg/l 420720R COD Reagent Vials Measuring Range 0-150mg/l, price includes compliant disposal of vials 420721 COD Reagent Vials Measuring Ranges 0-1500mg/l 420721R COD Reagent Vials Measuring Range 0-1500mg/l, price includes compliant disposal of vials 420722 COD Reagent Vials Measuring Range 0-15000mg/l 420722R COD Reagent Vials Measuring Range 0-15000mg/l, price includes compliant disposal of vials 25 vials per box 25 vials per box 25 vials per box 25 vials per box 25 vials per box 25 vials per box COD Standards Reagecon manufacture a comprehensive range of COD Standards. These standards are ideal for use as Control Standards to verify that correct analysis for COD has taken place. Achieving an acceptable result for the Control Standard will improve confidence in sample readings for this important environmental parameter. Cat No. description pack Size COD10 COD Calibration Standard 10mg/l Solution 500ml COD50 COD Calibration Standard 50mg/l Solution 500ml COD100 COD Calibration Standard 100mg/l Solution 500ml COD200 COD Calibration Standard 200mg/l Solution 500ml COD500 COD Calibration Standard 500mg/l Solution 500ml COD600 COD Calibration Standard 600mg/l Solution 500ml COD1000 COD Calibration Standard 1000mg/l Solution 500ml COD1300 COD Calibration Standard 1300mg/l Solution 500ml COD1500 COD Calibration Standard 1500mg/l Solution 500ml COD5000 COD Calibration Standard 5000mg/l Solution 500ml COD10M COD Calibration Standard 10000mg/l Solution 500ml www.reagecon.com Reagecon - Delivering the correct result 51
Page 1 and 2: Delivering The Correct Result ...
Page 3 and 4: Introduction Welcome to the new Rea
Page 5 and 6: New Developments at Reagecon Reagec
Page 7 and 8: pH BUFFER SOLUTIONS Reagecon manufa
Page 9 and 10: pH BUFFERS - 25˚C Product No. Desc
Page 11 and 12: TWIN NECK BOTTLE FORMAT pH Buffers
Page 13 and 14: LOW IONIC STRENGTH BUFFERS Reagecon
Page 15 and 16: CONDUCTIVITY STANDARDS These soluti
Page 17 and 18: EUROPEAN PHARMACOPOEIA REAGENTS Rea
Page 19 and 20: EUROPEAN PHARMACOPOEIA REAGENTS REA
Page 21 and 22: EUROPEAN PHARMACOPOEIA REAGENTS VOL
Page 23 and 24: ANALYTICAL VOLUMETRIC SOLUTIONS REA
Page 27 and 28: Products are manufactured under an
Page 31 and 32: CONCENTRATED VOLUMETRIC SOLUTIONS E
Page 33 and 34: INORGANIC SPECTROSCOPY STANDARDS El
Page 35 and 36: INORGANIC SPECTROSCOPY STANDARDS El
Page 37 and 38: INORGANIC SPECTROSCOPY STANDARDS MU
Page 39 and 40: INORGANIC SPECTROSCOPY STANDARDS AT
Page 41 and 42: INORGANIC SPECTROSCOPY STANDARDS AT
Page 43 and 44: STANDARDS AND CALIBRATORS CARBON ST
Page 45 and 46: STANDARDS AND CALIBRATORS ION SELEC
Page 47 and 48: STANDARDS AND CALIBRATORS CATION ST
Page 49 and 50: MILK TESTING REAGENTS FREEZING POIN
Page 51: STANDARDS AND CALIBRATORS SPECTROPH
Page 55 and 56: ELECTRODE CARE AND MAINTENANCE CONT
Page 57 and 58: INDICATOR SOLUTIONS The following c
Page 59 and 60: PERIODIC TABLE OF THE ELEMENTS www.
Page 61: Reagecon Diagnostics Ltd. Shannon F

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