Effects of mineral amendments on trace elements leaching from pre-treated marine sediment after simulated rainfall events

Abstract

Bauxite extraction by-products (red mud) were used to evaluate their potential ability to stabilize trace elements from dredged and aerated/humidified marine sediment. The investigated by-products were: bauxaline(BX) that is a press-filtered red mud; bauxsol™(BS) that is a press-filtered red mud previously washed with excess of seawater, and gypsum neutralized bauxaline (GBX). These materials were separately mixed to dredged composted sediment sample considering 5% and 20% sediment: stabilizer ratios. For pilot experiments, rainfall events were regularly simulated for 3 months. Concentrations of As, Mo, Cd, Cr, Zn, Cu, and Ni were analyzed in collected leachates as well as toxicity. Results showed that Cd, Mo, Zn, and Cu were efficiently stabilized in the solid matrix when 20% of BX, BS, and GBX was applied. Consequently, toxicity of leachates was lower than for the untreated sediment, meaning that contaminants mobility was reduced. A 5% GBX was also efficient for Mo, Zn and Cu stabilization. In all scenarios, As stabilization was not improved. Compared to all other monitored elements, Mo mobility seemed to depend upon temperature-humidity conditions during pilot experiments suggesting the need of further investigations.

Antifatigue Potential Activity of Sarcodon imbricatus in Acute Excise‐Treated and Chronic Fatigue Syndrome in Mice via Regulation of Nrf2‐Mediated Oxidative Stress

“…Minerals of SI were carried out according to previous studies with some modifications [ 35 ]. Briefly, SI (0.5 g of each time) was placed in a porcelain citrus pot and completely ashed and then dissolved in nitric acid (5 mL).…”

Hepatoprotective Effects of Antrodia cinnamomea: The Modulation of Oxidative Stress Signaling in a Mouse Model of Alcohol‐Induced Acute Liver Injury

“…Subsequently, the levels of minerals, potassium (K), sodium (Na), calcium (Ca), magnesium (Mg), iron (Fe), zinc (Zn), selenium (Se), manganese (Mn), chromium (Cr), copper (Cu), lead (Pb), mercury (Hg), arsenic (As), and cadmium (Cd), were detected by inductively coupled plasma optical emission spectrometry [28]. …”

Effects of carbon‐based materials and redmuds on metal(loid) immobilization and growth of Salix dasyclados Wimm. on a former mine Technosol contaminated by arsenic and lead

“…These carbon-based materials will subsequently be referred to as biochar 1 (Bc1), biochar 2 (Bc2), and AC, respectively. Similarly, three redmuds were employed: a commercial redmud (Bauxaline) provided by Alteo Environnement (Gardanne, France), the same redmud neutralized by gypsum (Hurel, Taneez, Ghirardini, & Libralato, 2017), also provided by Alteo Environnement, and a redmud directly collected from a charcoal mine located in Alès, France. Those three products will be referred to as redmud 1 (RM1), redmud 2 (RM2), and redmud 3 (RM3).…”