contact time


Also found in: Medical, Acronyms.

contact time

[′kän‚takt ‚tīm]
(engineering)
The length of time a substance is held in direct contact with a treating agent.
References in periodicals archive ?
The various factors affecting removal efficiencies of chromium, color and chemical oxygen demand such as pH, dose of Fe3O4 and contact time were considered for optimizing the operational conditions.
The effective contact time for each contact lens solution can be seen in (Figure 2).
In addition, the university provides students with an option for a further six hours contact time with course tutors on a drop-in basis; and a compulsory employability module for one semester of the year for two hours each week.
The relationships between horizontal velocity variables and contact time of jump phases were demonstrated in Table 5.
The parameters: pH, contact time, initial metal ion concentration, adsorbent dosage, and particle size, was each varied, one at at ime, while setting other parameters constant (set conditions, Table 1).
According to Lonza, formulators can achieve hospital-grade disinfection at two minutes contact time in the presence of 5% soil.
After 20 minutes contact time the suprenatant liquid from each conical flask was collected through syringes in the time interval of 10 minutes.
Figure 2 graphically shows relationship between contact time and sorption efficiency in different pH values.
7 mg/min ozone supplied, TS reduced to 67% and 59% after 20 minute contact time at pH 7 and 9 respectively.
Secondly the contact time specified on the label of the product is often too long to be practically followed for environmental surface disinfection in a health care setting, because for floors or surfaces, commonest practice is to apply a disinfectant and allowing it to dry within one minute.
Student-teacher contact time is further eroded by overcrowding.
Adsorption studies are carried out under different experimental variables including adsorbent dosage, solution pH, contact time, ionic strength, temperature, particle size and solute concentration.