Boron sources and transport mechanisms in river waters collected from southwestern Taiwan: Isotopic evidence

A high‐throughput system for boron microsublimation and isotope analysis by total evaporation thermal ionization mass spectrometry

“…geological samples can be used to explore natural processes such as the extent of water-rock/soil interactions or weathering processes, [2][3][4] airborne anthropogenic emissions, [5] clay mineral formation in soils at the soil-water-plant scale, [6] fluid transfer across tectonic subduction zones, [7] and seawater pH variations. [8][9][10][11][12] One of the most widely applied applications of boron isotopes in climate and aqueous chemistry is in determining the historical record of pH in seawater.…”

“…Reliable proxies of seawater pH during the Industrial Revolution and from recent millennia and into deep geologic time are few, but the d 11 B values derived from biogenic carbonates (e.g., corals, brachiopods, and foraminifera) have provided important constraints on ancient pH levels. [8,11,13] The dominant aqueous species of boron in seawater are B(OH) 3 and B(OH) 4 -. The relative proportion of these two species in seawater is a function of pH and can be described as:…”

“…At low pH, boron exists as B(OH) 3 in solution, and, conversely, at high pH, it exists as B(OH) 4 -. [14] The governing reaction for isotope exchange between these two species is: 10…”

Deviation of Boron Concentration From Predictions Using Salinity in Coastal Environments

“…Riverine B also has an anthropogenic component, which ranges from 5% to 40% among various riverine systems (Chetelat & Gaillardet, ; Chetelat et al, ; Y.‐C. Liu et al, ).…”

Seasonal Variations in Physico-Chemical Properties of Yamuna Water and its Suitability for Irrigation

“…Boron Boron, an essential element for crop plants becomes toxic above critical levels (Wimmer, 2013). Boron in river water can be contributed via cyclic seasalt, geothermal water, water-rock interaction i.e., chemical weathering and anthropogenic inputs (Liu et al, 2012 (Figure 6). Boron concentration in Yamuna water falls under category of slight to moderate restrictive use.…”