To evaluate weight lost from marble block after sitting in supplied solutions for 1 min, 5 min, 20min, 60min and 72 hours.
Date Run:
04/12/2022
Experiment Procedure:
Two solutions were prepared at 40% concentration, one being NTA 100 and the other DS IDA. The 3rd solution was made from 100% of the EDTA. 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:
40% DS IDA was the only chemistry that did not exceed 1% and was not effective at removing calcium. All marble blocks had an ashy appearance with 40% NTA leaving the most residue in solution.
Cleaner
Concentration
Initial
1 min
5 min
20 min
60 min
72 hours
Total loss
% Loss
NTA
40%
9.0446
9.0436
9.0406
9.0321
9.0168
8.6464
-0.3982
-4.40
DS IDA
40%
7.8137
7.8130
7.8102
7.8039
7.7906
7.7723
-0.0414
-0.53
EDTA
100%
9.1239
9.1234
9.1210
9.1097
9.1097
8.8051
-0.3188
-3.49
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
NTA at 40% concentration was more effective than EDTA at 100% concentration at removing calcium and lime. DS IDA at 40% concentration was not effective.
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