User manual HANNA INSTRUMENTS HI 3845

[. . . ] Instruction Manual Range SPECIFICATIONS 0 to 100 ppm Cr(VI) MR 100 to 1000 ppm Cr(VI) HR Smallest Increment 5 ppm Cr(VI) MR 50 ppm Cr(VI) HR Analysis Method Drop-Count Iodometric Titration Sample Size 5 mL MR 0. 5 mL HR Number of Tests 100 (average) Case Dimensions 235x175x115 mm (9. 2x6. 9x4. 5") Shipping Weight 416 g (14. 7 oz. ) INSTRUCTIONS READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT · Remove the cap from the plastic vessel. Fill the vessel with 5 mL of sample using the graduated plastic test tube for Chromium Medium Range. [. . . ] Note: mg/L is equivalent to ppm (parts per million). · Add 1 powder packet of HI 3845A-0 reagent and swirl gently to dissolve it. · Slowly add more drops of the HI 3845C-0 titration reagent, while swirling and counting the drops, until it changes from blue to colorless. · To obtain the concentration in ppm of Chromate ion CrO42- multiply the total number of drops of HI 3845C0 reagent used from the beginning of titration by 5 or 50 respectively, based on whether Chromium Medium Range or Chromium High Range is being determined. · Using the plastic spoon provided, add 1 spoon of HI 3845B-0 reagent and swirl gently to mix. 10/02 Dear Customer, Thank you for choosing a Hanna Product. Please read the instructions carefully before using the chemical test kit. It will provide you with the necessary information for correct use of the kit. Remove the chemical test kit from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any noticeable damage, notify your Dealer or the nearest Hanna office immediately. Each kit is supplied with: · HI 3845A-0 Chromium MR-HR Reagent, packets (100 pcs); · HI 3845B-0 Chromium MR-HR Reagent , 1 bottle (17 g); · HI 3845C-0 Chromium MR-HR Reagent , 2 bottles with dropper (60 mL); · Starch Indicator, 1 bottle with dropper (25 mL); · 1 calibrated plastic vessel (20 mL); · 1 plastic pipette (1 mL); · 1 plastic test tube, graduated with cap; · 1 spoon. Note: Any damaged or defective item must be returned in its original packing materials. # of DROPS * 5 = ppm Chromate (MR) # of DROPS * 50 = ppm Chromate (HR) · To convert the concentration in ppm of Cr(VI) multiply the ppm of chromate by 0. 45. · To convert the concentration in ppm of Na2CrO4 multiply the ppm of chromate by 1. 4. [. . . ] Continue adding the titration reagent until the yellow color of the solution is almost disappeared. REFERENCES Vogel's, Textbook of quantitative chemical analysis, 5th ed. , Longman Scientific and Technical HEALTH AND SAFETY The chemicals contained in this test kit may be hazardous if improperly handled. Read Health and Safety Data Sheets before performing the test. ISTR3845R2 [. . . ]