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<br />ANALYTICAL -GENERAL <br />6) Add distilled water to obtain 1 litre total volume and then mix well. <br />Introduction to Sample Preservation <br />Result: from cyanide analysis quite often are reported in terms such as total, :Free, <br />available, simple or complex. There is considerable confusion surrounding the use of some of <br />these terms and many of them are used interchangeably. <br />Cyanide analysis performed for the purpose of regulatory limits are always tonal cyanide <br />and weak acid dissociable cyanide (WAD). <br />Total cyanide is defined as all cyanide as CN~, HCN, weak metal cyanide complex and <br />strong metal cyanide complex including FeZ' and Fe". <br />Weak acid dissociable cyanide is defined as all cyanide as CN', HCN, and weak rnetal <br />cyanide complex. We will be conducting an intense study as to which metal species breakdown <br />and to what extent, <br />Problems Associated with Cyanide Analysis <br />A point to be emphasized is that the analysis of cyanide is not easy. Regulatory limits <br />require analysis in the parts per billion range (e.g. 10-500) which require careful experienced <br />analysts and strict attention to quality assurance programs. Although this may be difficult in the <br />mine assay lab environment (quality assurance), it is impossible to produce consistent high <br />quality data without these measures. <br />w,~,~~.„,~ 14 <br />