Long Term Stability Efficacy Test 1 Purpose To evaluate the residual chlorine stability properties 2 T est date From September 2002 to September 2003 3 Testing method KECA solution 4 9 ID: 841908
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1 KECA Disinfecting Solutions Long Term
KECA Disinfecting Solutions Long Term Stability & Efficacy Test 1. Purpose: To evaluate the residual chlorine stability properties 2. T est date: From September 2002 to September 2003 3. Testing method KECA solution: 4 9 . 6 ppm / ph 5.9 Place 20 L of KECA 50 generated solutions (available chlorine con centration 49.6 ppm = ph 5.9) in an airtight, opaque plastic container ad store on a shelf in an indoor room. Measure the available chlorine c oncentration (ACC) and pH level in one year. 4. Test results 4 - 1) The graph of available chlorine concentration variations 4 - 2) The graph of pH level variation 4
2 9.9 46.7 44.3 40 42 44 46 48 50 52 2002.
9.9 46.7 44.3 40 42 44 46 48 50 52 2002.9 2003.4 2003.9 Stability of available chlorine concentration Available chlorine concentration 5.7 5.8 5.9 6 6.1 6.2 6.3 2002.9 4.2003 2003.9 Change in pH level pH 2 5. The long term stability test on residual chlorine shows that the available chlorine concentration was slightly decreased, but still in the effective range of disinfecting solutions. The pH had also changed slightly. The solution kep t more than 80% of its available chlorine concentration when stored in an airtight. UV and strong light has a significant effect on the stability properties of the solution and it should be stored in a n opaque container.
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3 KECA Disinfecting Solutions Stability test at 122° F 1. Purpose To evaluate the residual chlorine stability properties 2. Test date September 20, 2007. Start at 8 AM 3. Testing method KECA disinfecting solution (available chlorine concentration 5 0 ppm) placed in (3x) 500 cc PET bottles. Test 1 : 500 ml Test 2 : 400 ml (space left in container for gas) Test 3 : 500 ml Test 1 : Closed container Test 2: Closed container Test 3: Open container Place all 3 bottles in 122°F thermo - bath. After 8 hours measure the available chlorine concentrati
4 on. 4. Test results 4 - 1) The ra
on. 4. Test results 4 - 1) The rate of change in available chlorine concentration Test No. Starting (ppm) Finish (ppm) Decrease amt. (ppm) Decrease rate (%) 1 Close d No gas 5 0 5 0 .0 0 0 2 Close d Gas 5 0 4 4 . 8 5 . 2 1 0 . 4 3 Open 5 0 3 1 . 5 1 8 . 5 37 0 10 20 30 40 50 60 8:00 (Start) 16:00 (End) Change in available chlorine concentration Mg/L (ppm) Test 1 Test 2 Test 3 4 5. Examination Test 1 showed no change in available chlorine concentration. Test 2 and test 3 showed a decreasing rate of 1 0 . 4 % and 37% change in available chlorine concentratio