Rapid on-line sample dissolution assisted by focused microwave radiation for silicate analysis employing flame atomic absorption spectrometry: iron determination.

Talanta · 2004 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3678

An on-line flow injection system coupled to a focused microwave unit enabled silicate rock slurry dissolution for iron determination by FAAS. Using 210 s irradiation at 90 W, the method achieved a detection limit of 0.80 µg/mL (reported as corresponding to 0.…

Study snapshot

PublicationTalanta · 2004

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

An on-line automated flow injection system with microwave-assisted sample digestion was used to perform silicate rock dissolution in acid medium for iron determination. For this purpose, a continuous flow system was built up by using an automatic flow injection analysis (FIA) system coupled to a flame atomic absorption spectrometer (FAAS), including a focused microwave oven unit. Inside the microwave cavity was inserted a polytetrafluoroethylene (PTFE) reactor coil (300cm length and 0.8mm i.d.) where the dissolution takes place. Chemical and flow variables as well as iron determination parameters were studied. In the flow system, a slurry of the rock sample (50mg in 200ml of acid mixture HF+HCl+HNO(3)) is pumped through the reaction coil and the microwaves are turned on. After elapsed the time required to complete the sample dissolution, the mixture is pumped again in order to fill the sampling loop (500mul). Then, by changing the valve position, a water carrier stream pushes the sample solution through the flame atomic absorption spectrometer nebulizer. To achieve an accurate determination of the rock certified materials, the slurry sample was irradiated during 210s at 90W power. Working in that condition, a detection limit of 0.80mugml(-1) (which corresponds to an Fe(2)O(3) content of 0.46%) and an analytical throughput of 10h(-1) were achieved. The relative standard deviation (R.S.D.) of the method varied between 1 and 11% when applied to the rock certified materials.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

Exposure210 s

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Outcomes measured

Silicate rock dissolution in acid medium for iron determination
Analytical performance (detection limit, throughput, precision/RSD) using FAAS

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "focused microwave oven unit (microwave-assisted sample digestion)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "210 s"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Silicate rock dissolution in acid medium for iron determination",
    "Analytical performance (detection limit, throughput, precision/RSD) using FAAS"
  ],
  "main_findings": "An on-line flow injection system coupled to a focused microwave unit enabled silicate rock slurry dissolution for iron determination by FAAS. Using 210 s irradiation at 90 W, the method achieved a detection limit of 0.80 µg/mL (reported as corresponding to 0.46% Fe2O3), throughput of 10 h−1, and RSD between 1% and 11% on certified rock materials.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave-assisted digestion",
    "focused microwave radiation",
    "flow injection analysis",
    "flame atomic absorption spectrometry",
    "silicate rock dissolution",
    "iron determination",
    "PTFE reactor coil",
    "HF",
    "HCl",
    "HNO3",
    "analytical method"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1016/j.talanta.2003.10.002
PubMed: 18969366

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