Report on measurements of alkalization rate
Prof. dr hab. inż. Ryszard J. Kaleńczuk
Szczecin, 25 May 2018 r.
Examination of alkalizing capacity of samples sent by Evergreen Solutions
1. Preparation of the procedure
In order to carry out the tests, an apparatus consisting of the following elements was completed:
- Glass container with a capacity of 500 cm3
- Magnetic stirrer (Wiga ES 21H) with speed control
PH meter (Elmetron CP 401) equipped with pH electrode and temperature sensor
The set of apparatuses and samples subjected to test are shown in Fig. 1
2. Description of measurements
The samples supplied for measurements were triturated in an agate mortar so as to give them the same granulation. The glass container was filled with 300 cm3 of distilled water. After calibrating the pH meter, the measuring electrode and temperature sensor were placed in the vessel, and then the magnetic stirrer was operated. The same number of revolutions of 750 rpm was used in each experiment. Next, a constant, analytical scale-weighed, 1g sample of the analyte was added to the container and the stopwatch was turned on to control the process time. In all experiments, the same measurement temperature of 20° C was used. At selected time points, the pH value was recorded. The test was carried out until the two consecutive readings gave the same value.
3. Measurement results
The results of measurements for individual samples are shown in Figures 2 – 4 and Tables 1 – 3.
Measurement results of the alkalisation rate for the OrCal® pHregulator® sample – series OrCal® product made from post-production biomass using a certified WapCal® reagent, according to the R.292513 standard
|item||Time (s)||Value pH|
The results of the alkalisation rate for the sample – dolomite – loose calcium carbon-magnesium fertilizer
|Item||Time (s)||Value pH|
The results of the alkalization rate measurements for the sample – granulated chalk with magnesium
|Item.||Time (s)||Value pH|
After testing the rate of alkalisation of the environment using the samples provided by Evergreen Solutions, it was found that:
- The speed of the alkalisation process is the highest with the use of a sample of material called OrCal® pHregulator® – OrCal® product made from post-production biomass using a certified WapCal® reagent according to the standard No. R.292513
- Subsequent delivered materials have a slower effect, with granulated chalk and magnesium acting faster
- The supplied materials differ in the maximum pH value possible to obtain with their use. Sample No. 1 (OrCal) allows to obtain a highly alkaline environment (pH = 12.69), while other materials are significantly less alkalizing (chalk – pH = 9.53; dolomite – pH = 7.73)