NF ISO 21438-1
Workplace atmospheres - Determination of inorganic acids by ion chromatography - Part 1 : non-volatile acids (sulphuric acid and phosphoric acid)
ISO 21438-1:2007 specifies a method for the determination of the time-weighted average mass concentration of sulfuric acid and phosphoric acid in workplace air by ion chromatography. The method is applicable to the personal sampling of the inhalable fraction of airborne particles, as defined in ISO 7708 and to static (area) sampling. The analytical method is applicable to the determination of masses of 0,005 mg to 2,000 mg of sulfuric acid and phosphoric acid per sample, without dilution. The concentration range of sulfuric acid and phosphoric acid in air for which the measuring procedure is applicable is determined by the sampling method selected by the user. For an air sample of volume 1 m3, the working range is approximately 0,005 mg/m3 to 2,000 mg/m3. The method is not applicable to the determination of sulfur trioxide. The procedure does not allow differentiation between the acids and their corresponding salts if both are present in the air. The procedure does not allow differentiation between phosphoric acid and diphosphorus pentoxide (phosphoric anhydride) if both are present in the workplace.
ISO 21438-1:2007 specifies a method for the determination of the time-weighted average mass concentration of sulfuric acid and phosphoric acid in workplace air by ion chromatography.
The method is applicable to the personal sampling of the inhalable fraction of airborne particles, as defined in ISO 7708 and to static (area) sampling.
The analytical method is applicable to the determination of masses of 0,005 mg to 2,000 mg of sulfuric acid and phosphoric acid per sample, without dilution.
The concentration range of sulfuric acid and phosphoric acid in air for which the measuring procedure is applicable is determined by the sampling method selected by the user. For an air sample of volume 1 m3, the working range is approximately 0,005 mg/m3 to 2,000 mg/m3.
The method is not applicable to the determination of sulfur trioxide.
The procedure does not allow differentiation between the acids and their corresponding salts if both are present in the air.
The procedure does not allow differentiation between phosphoric acid and diphosphorus pentoxide (phosphoric anhydride) if both are present in the workplace.
<p>This document specifies a method for the determination of the time-weighted average mass concentration of sulfuric acid and phosphoric acid in workplace air by ion chromatography. The anions are detected by conductivity.</p> <p>The method is applicable to the personal sampling of airborne particles, as defined in ISO 7708, and to static (area) sampling.</p> <p>The method does not apply to the determination of sulfur trioxide.</p> <p>The procedure does not differentiate between the acids and their corresponding salts if both are present in the workplace air.</p> <p>The procedure does not differentiate between phosphoric acid and diphosphorus pentoxide (phosphoric anhydride) if both are present in the workplace air.</p>
- Avant-proposiv
- Introductionv
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1 Domaine d'application1
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2 Références normatives1
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3 Définitions2
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3.1 Définitions générales2
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3.2 Définitions des fractions de taille de particules3
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3.3 Définitions relatives à l'échantillonnage3
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3.4 Définitions relatives à l'analyse4
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3.5 Termes statistiques5
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4 Principe6
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5 Exigences7
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6 Réactifs7
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7 Appareillage9
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7.1 Matériel d'échantillonnage9
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7.2 Appareillage de laboratoire11
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8 Évaluation de l'exposition professionnelle13
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8.1 Généralités13
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8.2 Échantillonnage individuel13
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8.3 Échantillonnage à point fixe13
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8.4 Sélection des conditions de mesurage et du mode de mesurage13
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9 Échantillonnage15
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9.1 Considérations préliminaires15
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9.2 Préparation du prélèvement d'échantillons17
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9.3 Point d'échantillonnage17
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9.4 Prélèvement des échantillons18
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9.5 Transport18
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10 Analyse19
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10.1 Préparation des solutions d'essai et d'étalonnage19
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10.2 Analyse instrumentale20
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10.3 Estimation des limites de détection et de quantification21
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10.4 Maîtrise de la qualité22
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10.5 Incertitude de mesure23
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11 Expression des résultats23
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12 Performances de la méthode24
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12.1 Prélèvement et conservation de l'échantillon24
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12.2 Limites de quantification24
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12.3 Limites supérieures de la gamme d'analyse24
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12.4 Biais et fidélité24
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12.5 Incertitude de l'échantillonnage et de la méthode d'analyse24
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12.6 Interférences25
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13 Rapport d'essai25
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13.1 Procès-verbal de l'essai25
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13.2 Rapport de laboratoire26
- Annexe A (informative) Correction de température et de pression27
- Bibliographie29
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