Next, known weight of wood samples was crushed and added to permethrin solution of known concentration.
Usually a liquid solution of a chemical reagent (a titrant) of known concentration is placed in a buret, which is a glass tube with calibrated volume graduations.
Buffer solutions were prepared from NaCl and HCl of known concentration.
The limit of detection for alizarin was estimated to be 7×10 -15 g from tests using solutions of known concentration.
To calculate the concentrations in the extract, a calibration curve was drawn for four solutions of known concentration in acetone.
To calculate the concentrations in the extract, a calibration curve was drawn for four solutions of known concentration in water.
In a typical experiment, known amount of γ-alumina was added to 20 mL of fluoride solution of known concentration, in a 100 mL capped conical flask.
A standard stock solution of known concentration of brilliant green dye (BG) was prepared by dissolving solid particles of BG dye in distilled water.
At the required flow rate, metal solution of known concentration was fed from the feed tank with the help of peristaltic pump.
Batch biosorption trials were studied through shake flask method by adding known amount of biosorbent to Pb II) solution (100 mL) of known concentration.
Of the supernatant, 400 μL was added into a 4-mL aqueous solution of Coomassie Brilliant Blue G-250 of known concentration.
