Versión en Español
Simplified Suspended Solids Test for Sodium Hypochlorite Solutions
This procedure describes how to use a filter test system as an aid to easily determine
the clarity of sodium hypochlorite solutions. The bleach filter test equipment is
inexpensive and is designed for use at the customer's site. For laboratory-quality
equipment and procedures, please refer to the the "Suspended Solids Quality Test for Bleach Using Vacuum Filtration."
Apparatus: Field Bleach Vacuum Test Kit (see Figure 1 below)
To Order a Field Bleach Vacuum Test Kit, contact
a Powell Sales Representative and request Powell Item #: 935-05586.
1. Nalgene™ 180 PVC Vacuum Tubing
2. Barnant Portable Air/Vacuum Pressure Stations
3. Nalgene™ Brand Polypropylene Flask with Angled Tabulation
4. Nalgene™ Vacuum Filter Holder
5. Millipore™ Filters, AA type, 0.8 uM pore size
6. 1000 ml graduated cylinders or beakers
Procedure Note: All apparatus should be kept clean and dust free
1. Assemble filter. Use forceps to place one filter on plastic support base. Put filter
funnel and clamp in place.
2. Shake sample bottle. Fill graduated cylinder or beaker to the 1000 ml mark with
3. Start Vacuum.
4. Slowly pour the 1000 ml into the top of the vacuum holder. When sample has filtered
through completely, record the time to filter.
Note: Bleach that has not been filtered with submicron filtration will take approximately
6 to 8 times longer than filtered product. Typically 1000 ml of high clarity bleach
will take less than three minutes at 20" Hg vacuum. After filtration, the filter
paper should be near white with virtually no retained particles. Discolored filter
paper typically indicates the presences of iron.
More Sodium Hypochlorite Equipment from Powell