Sökning: "oxalate extraction"

Hittade 4 uppsatser innehållade orden oxalate extraction.

  1. 1. Solubility of arsenic in untreated and ZVI-treated contaminated aquifer material

    Master-uppsats, SLU/Dept. of Soil and Environment

    Författare :Oscar R. Davies; [2022]
    Nyckelord :Hjältevad; zerovalent iron; phosphate extraction; Oxalate extraction; Visual MINTEQ; geochemical modelling;

    Sammanfattning : Arsenic (As) is a toxic element to all life and exists in nature both naturally and anthropogenically. Naturally As contaminated soils are formed due to high geogenic background As concentrations which is released when bedrock is eroded. Asia is a continent with a high amount of naturally As contaminated soils and groundwater. LÄS MER

  3. 2. Remediation of an arsenic-contaminated anoxic aquifer in hjältevad with zerovalent iron : assessment and modelling of sorption strength and solubility of arsenic

    Master-uppsats, SLU/Dept. of Soil and Environment

    Författare :Kathrin Leicht; [2021]
    Nyckelord :arsenic remediation; zerovalent iron; anoxic aquifer;

    Sammanfattning : In-situ injection of zerovalent Iron (ZVI) particles to remediate contaminated groundwater is a widely applied approach. However, studies assessing the remediation and immobilisation mechanisms of Arsenic (As) under anoxic field conditions with zerovalent iron particles are lacking, especially for nanosized sulphidated ZVI (S-nZVI) and oxidic shell free ZVI (OSF-nZVI). LÄS MER

  4. 3. Geochemistry of arsenic and heavy metals in pyrite ash : speciation, solubility control mechanisms and geochemical modelling

    Master-uppsats, SLU/Dept. of Soil and Environment

    Författare :Gunilla Theorin; [2015]
    Nyckelord :soil contamination; leaching tests; extractions; EDTA; kinetics; surface complexation modelling;

    Sammanfattning : This thesis was part of a project at the Swedish Geotechnical Institute aiming at investigating the geochemistry of heavy metals and arsenic in pyrite ash. The spe-cific aims with this work were to extend the knowledge on solubility control mechanisms of metals in pyrite ash and how the sorption ability of the ash was dependent on content of iron (hydr)oxides. LÄS MER

  5. 4. Fosforavskiljning och hydraulisk konduktivitet i markbaserade reningssystem – Kornstorleksfördelningens betydelse

    Uppsats för yrkesexamina på avancerad nivå, Institutionen för geovetenskaper

    Författare :Elin Elmefors; [2011]
    Nyckelord :soil infiltration system; WSAS; grain size distribution; phosphorus; phosphorus removal; hydraulic conductivity; specific surface; oxalate extraction; markbaserade reningssystem; kornstorleksfördelning; fosfor; fosforavskiljning; fosforrening; hydraulisk konduktivitet; specifik yta; oxalatextraktion;

    Sammanfattning : Fosforutsläpp kan leda till övergödning i vattenrecipienten om kritiska nivåer överskrids. De enskilda avloppen står idag för en relativt stor andel av Sveriges fosforutsläpp jämfört med de kommunala avloppen. LÄS MER