Evolution of Mg/Ca and Sr/Ca ratios during the experimental dissolution of limestone

Pracný, Pavel; Faimon, Jiřı́; Všianský, Dalibor; Přichystal, Antonín

doi:10.1016/j.chemgeo.2019.05.040

Cited by 11 publications

(9 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sr was recognized to be released from congruent dissolution of Mg-calcite and strontium probably represents a minor impurity in calcite crystal lattice [7,15]. In this research, Sr/Mg had a similar horizontal trend to Ca/Mg although it was three orders of magnitude lower than Ca/Mg (Ca/Mg and Sr/Mg, R 2 = 0.92, p ≤ 0.01), indicating that Sr, as a minor impurity in limestone, was dissolved out along with dissolution of Ca rather than congruent dissolution with Mg. Molar ratio of 4.01 × 10 −3 for Sr/Mg at inlets was higher than that of 2.42 × 10 −3 in the central lake region, indicating [Sr] enrichment probably associated with different dynamics of Sr and Mg leaching; this might be caused by a substantial release of Mg from dissolving dolomite compared to the decreasing Sr release from Mg-calcite [35]. Land runoff brought in abundant metallic elements and minerals through river input, Ca 2+ , Mg 2+ , Na + and K + amounted to 4.89 mmol·L −1 and total trace metals reached up to 17.2 × 10 3 nmol·L −1 at 3-I.…”

Section: Surface and Underlying Watermentioning

confidence: 83%

“…SO4 2− played a critical role as electron acceptor [34] during particulates' degradation and unbound Ca 2+ , Mg 2+ in certain ratios (SO4 2− and ratio of Ca/Mg, R 2 = 0.75, p ≤ 0.01). Ca/Mg values were used to indicate the paleo-climatic changes and the dynamics of material elements from limestone dissolution [35]. Molar ratios of Ca/Mg averaged 2.45 at inlets and achieved a peak value of 2.54 at I-2, indicated the preferential dissolution of Ca from Mg-calcite and dolomite or from another fresh mineral surface [24,35].…”

Section: Surface and Underlying Watermentioning

confidence: 99%

“…Sr was recognized to be released from congruent dissolution of Mg-calcite and strontium probably represents a minor impurity in calcite crystal lattice [7,15]. In this Ca/Mg values were used to indicate the paleo-climatic changes and the dynamics of material elements from limestone dissolution [35]. Molar ratios of Ca/Mg averaged 2.45 at inlets and achieved a peak value of 2.54 at I-2, indicated the preferential dissolution of Ca from Mg-calcite and dolomite or from another fresh mineral surface [24,35].…”

Section: Surface and Underlying Watermentioning

confidence: 99%

“…In this Ca/Mg values were used to indicate the paleo-climatic changes and the dynamics of material elements from limestone dissolution [35]. Molar ratios of Ca/Mg averaged 2.45 at inlets and achieved a peak value of 2.54 at I-2, indicated the preferential dissolution of Ca from Mg-calcite and dolomite or from another fresh mineral surface [24,35]. However, this value fluctuated around 1.00 suggesting that the congruent dissolution for Ca and Mg from limestone resulted in the linear reaction path in the central lake region.…”

Section: Surface and Underlying Watermentioning

confidence: 99%

“…Dissolved Fe was much higher at inlets than the central lake region due to reduction of Fe(oxy)hydroxide under relatively anaerobic conditions [39,40] and it fluctuated around 1935 nmol·L −1 in the central lake region and outlet. It was pointed out that Sr, Fe and Mn were contained in calcite structure, clay minerals and pyrite [35]. Dissolved Fe was one of the metallic elements that originated from limestone disintegration (Fe and ratios of Ca/Mg, Sr/Mg, R 2 = 0.96, p ≤ 0.01).…”

Section: Surface and Underlying Watermentioning

confidence: 99%

See 4 more Smart Citations

Spatial Variations of Trace Metals and Their Complexation Behavior with DOM in the Water of Dianchi Lake, China

Xiao

Mostofa

et al. 2019

IJERPH

View full text Add to dashboard Cite

The dynamics of trace metals and the complexation behavior related to organic matter in the interface between water and sediment would influence water quality and evolution in the lake system. This study characterized the distribution of trace metals and the optical properties of dissolved organic matter (DOM) on the surface, and the underlying and pore water of Dianchi Lake (DC) to understand the origin of metals and complexation mechanisms to DOM. Some species of trace metals were detected and Al, Ti, Fe, Zn, Sr and Ba were found to be the main types of metals in the aquatic environment of DC. Ti, Fe, Sr and Ba predominated in water above the depositional layer. Al, Ti, Fe and Sr were the most abundant metallic types in pore water. Mn and Zn were the main type found at the southern lake site, reflecting the contribution of pollution from an inflowing river. The correlations between DOM and metals suggested that both originated from the major source as particulate organic matter (POM), associated with weathering of Ca-, Mg-carbonate detritus and Fe- or Mn-bearing minerals. High dynamics of DOM and hydrochemical conditions would change most metal contents and speciation in different water compartments. Proportions of trace metals in dissolved organic carbon (DOC) in natural waters were correlated with both DOM molecular weight and structure, different metals were regulated by different organic properties, and the same metal also had specific binding characteristic with DOM in various water compartments. This study highlighted the interrelation of DOM and metals, as well as the pivotal role that organic matter and nutrients played during input, migrations and transformations of metals, thereby reflecting water quality evolution in the lake systems.

show abstract

Section: Surface and Underlying Watermentioning

confidence: 83%