The combination of infrared and microwave radiation to quantify trace elements in organic samples by ICP OES.

Talanta · 2013 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 6547

Study snapshot

PublicationTalanta · 2013

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Sample-decomposition methods using microwave radiation in closed systems have been commonly used in the analysis of inorganic constituents; however, these methods are limited to small amounts of organic samples. This work proposes the combined use of infrared radiation and microwave radiation (IR-MW) to increase the amount of organic samples digested. The determination of Al, Ca, Cu, Fe, K, Mg, Mn, Na, P and Zn in human-feed samples was accomplished by ICP OES. The results were in agreement with those obtained from conventional decomposition by microwave radiation (closed system). The results obtained using the proposed IR-MW system for standard reference material (whole milk powder, NIST 8435) were also compared. Agreements of 85-100% were obtained for Al, Ca, Cu, Fe, K, Mg, Na, P and Zn in the standard reference material. The IR-MW system is simple to implement and cheap because it uses commercially available infrared lamps and allows the use of infrared radiation in the microwave-digestion vessel. Additionally, it is possible to reach better precision in the analysis of the human-feed samples using the IR-MW system. The proposed method also allows total digestion of large sample amounts or samples rich in organic compounds can also be performed in the IR-MW system using small volumes of nitric acid.

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AI evidence extraction

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Study typeother

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

A combined infrared–microwave (IR-MW) digestion approach was proposed to increase the amount of organic sample digested for ICP OES analysis. Results for human-feed samples were reported as in agreement with conventional closed-system microwave digestion, and for NIST 8435 whole milk powder agreements of 85–100% were reported for multiple elements; better precision was also reported for human-feed samples using IR-MW.

Outcomes measured

Analytical performance of IR-MW digestion for trace element quantification by ICP OES (Al, Ca, Cu, Fe, K, Mg, Mn, Na, P, Zn)
Agreement with conventional microwave digestion results
Agreement with standard reference material (NIST 8435 whole milk powder)
Precision of measurements
Ability to digest larger amounts of organic samples with small nitric acid volumes

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "microwave digestion system (laboratory sample decomposition)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Analytical performance of IR-MW digestion for trace element quantification by ICP OES (Al, Ca, Cu, Fe, K, Mg, Mn, Na, P, Zn)",
    "Agreement with conventional microwave digestion results",
    "Agreement with standard reference material (NIST 8435 whole milk powder)",
    "Precision of measurements",
    "Ability to digest larger amounts of organic samples with small nitric acid volumes"
  ],
  "main_findings": "A combined infrared–microwave (IR-MW) digestion approach was proposed to increase the amount of organic sample digested for ICP OES analysis. Results for human-feed samples were reported as in agreement with conventional closed-system microwave digestion, and for NIST 8435 whole milk powder agreements of 85–100% were reported for multiple elements; better precision was also reported for human-feed samples using IR-MW.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "infrared radiation",
    "microwave radiation",
    "sample digestion",
    "ICP OES",
    "trace elements",
    "organic samples",
    "human-feed samples",
    "NIST 8435",
    "whole milk powder",
    "nitric acid"
  ],
  "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.2013.01.047
PubMed: 23598225

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