Hanna Instruments HI 3850 Instruction Manual

Instruction Manual
HI 3850
Ascorbic Acid
Test Kit
www.hannainst.com
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 dam-
age, notify your Dealer or the nearest Hanna office
immediately.
Each kit is supplied with:
• HI 3850A-0 Ascorbic Acid Reagent, 1 bottle (100
mL);
• Starch Indicator, 1 bottle with dropper (25 mL);
• HI 3850C-0 Ascorbic Acid Reagent, 1 bottle (100
mL);
• 2 calibrated plastic vessels (50 mL);
• 1 plastic pipette (3 mL);
• 2 plastic pipettes (1 mL);
• 1 plastic test tube, graduated with cap.
Note: Any damaged or defective item must be returned
in its original packing materials.
SPECIFICATIONS
Range 10 to 200 ppm Ascorbic Acid
Smallest Increment 10 ppm Ascorbic Acid
Analysis Method Drop-Count Iodometric Titration
Sample Size 10 mL
Number of Tests 100 (average)
Case Dimensions 235x175x115 mm (9.2x6.9x4.5")
Shipping Weight 519 g (18.3 oz.)
SIGNIFICANCE AND USE
Ascorbic acid (Vitamin C) is added as a flavoring and
preservative agent to juice-based beverages. This kit is
especially designed for the determination of the content in
Vitamin C of beverages. It is based on drop-count titration
and is practical also with intensively colored samples.
Reducing substances interfere in the determination of Ascor-
bic Acid with this test kit.
Note: mg/L is equivalent to ppm (parts per million).
CHEMICAL REACTION
Ascorbic acid (C H O ) undergoes an oxidation reaction with
potassium iodate in acidic condition. The quantity of potas-
sium iodate consumed is then determined iodometrically.
INSTRUCTIONS
READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT
• Fill the graduated plastic test tube up to the 10 mL
mark with the sample and pour it in the calibrated
vessel. Add deionized water up to the 50 mL mark to
dilute. Similarly prepare another sample using the
other calibrated vessel and keep it as a reference for the
initial color.
• Using the plastic dropper add 1 mL of HI 3850A-0
reagent to one sample only. Swirl to mix.
• Add 4 drops of Starch Indicator and swirl to mix.
• Add drops of HI 3850C-0 reagent, while swirling and
counting the drops, until a persistent blue color is
developed. Compare the solution to the unreacted sample
to be sure of the color change.
• Count the drops needed to obtain the color change.
To calculate the concentration of Ascorbic Acid multi-
ply by 10 the number of drops of HI 3850C-0
titration reagent used:
# of DROPS 10 = ppm C H O
6 8 6
REFERENCES
Skoog, West, Holler; Fundamentals of Analytical Chemistry;
Saunders College Publishing International Edition (5 ed.)
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.