The stable isotopic composition of hydrogen and oxygen (δ 2 H and δ 18 O) and tritium activity ( 3 H) are monitored in monthly precipitation at Ljubljana since 1981. Here we present complete set of numerical data and the statistical analysis for period
Green inhibitors (GI) are eco-friendly organic molecules capable of inhibiting the nucleation and precipitation of solids, like CaCO 3 minerals. Although increasingly used in technical settings, their individual selection and dosage guidelines are hardly available and mostly based on empirical observations. In this study the performance of GI, based on aspartate, maleic, and acrylic acid, in concentrations between 0.5 and 10 mg L −1 , was assessed using a newly designed experimental test procedure. The inhibition of CaCO 3 scaling introduced by CO 2 degassing was quantified by thermodynamic modeling. The coupled CO 2 degassing and CaCO 3 precipitation rate models and time-resolved experimental data sets show (i) GI performance to be independent of CO 2 degassing rates, (ii) an upper supersaturation limit for calcite approaching amorphous CaCO 3 solubility, (iii) average efficiencies reaching ∼70−100% and normalized retardation time (delay of precipitation relative to the control test) of ∼3−6 times at a GI concentration of 10 mg L −1 , and (iv) polyaspartate being able to modulate calcite to serve as a template for vaterite growth depending on polymer chain-length, D/L ratio, and ion diffusion rate of the GI. Our rate-model-aided test procedure provides a compact and fast tool to assess and quantify GI performances against CaCO 3 scaling to be properly selected and individually tuned.
The stable isotopic composition of hydrogen and oxygen (d O pa zna{a 0,13 ‰/°C. Srednja tehtana vrednost devterijevega presežka (deuterium excess) zna{a 9,8 ‰ in se spreminja sezonsko ter odraža vpliv razli~nih zra~nih mas (atlantskih ali sredozemskih). Tudi aktivnost tricija v mese~nih padavinah kaže sezonske spremembe. Srednja tehtana vrednost zna{a 6,9 TU.
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