What are a Quats?
Quaternary ammonium compounds are a chemically diverse group of permanently charged cations with four aryl or alkyl side groups. See benzalkonium chloride
as an example.
Quats are effective against bacteria, amoebas, fungi, enveloped viruses & invertebrate larvae because they disrupt cell membranes at levels as low at 200ppm. They are not sporocidal or effective against hydrophilic viruses.
All Indigo® quat test strips
are Made in USA & and are Q/A'd against NIST standards.
Indigo® Quat/QAC Test Strip Technical Specifications
Quaternary ammonium sanitizers
- 10 to 100ppm: ≤10-20-30-50-100ppm; read results in 10 seconds
- 0 to 400ppm: 0-100-200-300-400ppm; read results in 10 seconds
- 0-1500ppm: 0-200-400-750-1000ppm; read results in 5 seconds
- 0-10000ppm; : 0-1000-2500-5000-10000ppm; read results in 5 seconds
are important for hard surface disinfection where food is prepared. Here are some pros & cons.
|Nontoxic, odorless, colorless, noncorrosive, nonirritating
||Slower at killing some microorganisms
|Relatively stable in the presence of organic matter
||Not compatible with some detergents
|Active over a wide pH range but best in the range of pH 8-11
||Not compatible with hard water
||Color charts start to deviate at 45C (110F) & above
How to Dilute Quaternary Ammonium Compounds
disinfectants are formulated with more than one quaternary ammonium compound & may be designated as "multi-quats". Indigo® test strips are calibrated for Oasis 146 consisting of:
To dilute any multi-quat accurately, add up the percentages of the quats used in the formulation. For Oasis 146, they add up to 7.5%. Use this percentage in our Dilution Equation Calculator
to prepare a 1L/1US quart spray bottle as in this example
Step 1: enter 7.5%.
Step 2: enter 1500ppm as the desired final concentration
Step 3: enter 1000mL (=1L, =~1 US quart) for the amount of water
Step 4: press Calculate to see that 20mL (~1 oz) of quat added to the 1L of water (0.98L to be really precise) gives you a 1500ppm solution.
If you're good with math, you can check these results. First. converting 7.5% to 75000ppm. Then 1500ppm divided by 75000ppm equals 1/50 which is the same ratio as 20mL/1000mL.
Not clear on percent vs ppm? See our blog: Diluting Chlorine, Peroxide or Quat Sanitizers is Easy