To evaluate weight lost from marble block after sitting in supplied solutions for 1 min, 5 min, 20min, 60min and 72 hours.
Date Run:
05/10/2022
Experiment Procedure:
Three solutions at 40% concentration known as NTA, DS IDA, and EDTA were used for this experiment. Several marble chips of similar size and shape were weighed to determine the baseline weight of each piece. The marble was then placed in small beakers, one for each solution, and immersed completely. The marble pieces were then taken out at the 1-minute mark, quickly rinsed, and then dried with paper towels. They were then taken out at 5 minutes, 20 minutes, and 60 minutes following the same process. They were immersed in the solution after the 60-minute mark and left over the weekend (72 hours) to soak. They were then taken out, dried, and their final weights were taken and recorded.
Trial Results:
DS IDA and EDTA were used as is as they were already at the desired 40% concentration. The NTA solution was prepared prior to experimentation. 40% DS IDA was the only chemistry that did not exceed 1% and was not effective at removing calcium/lime. All marble blocks had lost a significant amount of color and were ashy in appearance.
Cleaner
Concentration
Initial
1 min
5 min
20 min
60 min
72 hours
Total loss
% Loss
NTA
40%
18.6233
18.6067
18.5795
18.5542
18.5165
17.9448
-0.6785
-3.78
DS IDA
40%
20.9868
20.9838
20.9839
20.9663
20.9593
20.9434
-0.0434
-0.21
EDTA
40%
21.0188
21.0177
20.9748
20.9440
20.8922
19.6468
-1.3720
-6.98
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
The EDTA solution was the most effective at removing calcium/lime with a percent loss of 6.98. NTA was less effective at 3.78% loss but performed better than DS IDA, which had only a 0.21% loss.
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