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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

Fig. 1 Measurement set for testing the rate of alkalinization along with samples of the substance:
1) OrCal® pHregulator® – a product from the OrCal® series made from post-production biomass using the WapCal® certified reagent in accordance with the standard No. R.292513;
2) Dolomite – powdery carbonaceous calcium fertilizer
3) Granulated chalk with magnesium

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.

Fig. 2. 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

Fig. 3. The results of the alkalisation rate for the sample – dolomite – loose calcium carbon-magnesium fertilizer

Fig. 4. The results of the alkalization rate measurements for the sample – granulated chalk with magnesium


Table 1.

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

itemTime (s)Value pH
107,35
21510,84
33011,61
44511,91
56012,08
67512,20
79012,28
812012,40
915012,48
1018012,55
1121012,60
1224012,63
1327012,67
1430012,69
1533012,69

Table 2

The results of the alkalisation rate for the sample – dolomite – loose calcium carbon-magnesium fertilizer

ItemTime (s)Value pH
107,35
2157,37
3307,43
4607,51
5907,55
61207,60
71807,65
82407,69
93007,73
103607,73

Table 3

The results of the alkalization rate measurements for the sample – granulated chalk with magnesium

Item.Time (s)Value pH
107,26
2157,45
3307,76
4608,31
5908,68
61208,97
71809,28
82409,40
93009,47
103609,53
114209,53


Summary

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)