標準號：BS ISO 10312-1995
中文標準名稱：周圍環境空氣.石棉纖維的測定.直接傳遞透射電子顯微法
英文標準名稱：Ambient air. Determination of asbestos fibres. Direct-transfer transmission electron microscopy method
標準類型：C51
發布日期：1995/10/15 12:00:00
實施日期：1995/10/15 12:00:00
中國標準分類號：C51
國際標準分類號：13.040.20
適用范圍：1 Substance determined This International Standard specifies a reference method using transmission electron microscopy for the determination of the concentration of asbestos structures in ambient atmospheres and includes measurement of the lengths, widths and aspect ratios of the asbestos structures. The method allows deter-mination of the type(s) of asbestos fibres present. The method cannot discriminate between individual fibres of the asbestos and non-asbestos analogues of the same amphibole mineral. 2 Type of sample The method is defined for polycarbonate capillary-pore filters or cellulose ester (either mixed esters of cellu-lose or cellulose nitrate) filters through which a known volume of air has been drawn. The method is suitable for determination of asbestos in both exterior and building atmospheres. 3 Measuring range The range of concentration which can be determined is 50 structures/mm