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CYANIDE TOXICITY <br /> ntrations for Extremely Hn7mrcloiir, Waste <br /> The extremely azardous waste criteria are set forth in Section <br /> 66720, Title 22, California Code of Regulations (§66720, 22 CCR) . <br /> Briefly, they are as follows: <br /> 1) 966720(a) (1) : Acute oral LD. <— 50 mg/kg; <br /> 2) " (a) (2) : Acute dermal LD. <— 43 mg/kg; <br /> 3) " (a) (3) : Acute inhalation LCw <_ 100 ppm; <br /> 4) " (a) (4) : Contains any of the carcinogens in <br /> §66696(x) (5) at a single or combined <br /> concentration of z 0.1%; <br /> 5) " (a) (5) : Has been shown through experience or <br /> testing to pose an extreme hazard; <br /> 6) " (a) (6) : Is water reactive; <br /> 7) §6672 (a) Contains any of the persistent and <br /> bioaccumulative toxic substances at a <br /> concentration 2 its total threshold limit <br /> concentration. <br /> Of these, the my criteria that cyanide bearing compounds have <br /> been demonstrat d to fail is 11 (and possibly 15 , although it is <br /> standardless) . As found in RTECS, 1985-6 (NIOSH) , the lowest <br /> ( observed oral ,, for rats found in the literature for a cyanide <br /> compound is for sodium cyanide at 6.4 mg/kg. <br /> If a compound p esent in the waste exceeds the acute oral or acute <br /> dermal toxicity thresholds in 11 or 2 above, § 66720(b) allows for <br /> the use of the quation in §66696(c) : <br /> Calculated oral or dermal LD,, = 100 <br /> :-� % <br /> Since the oral w of sodium cyanide is 6.4 mg/kg, and therefore <br /> less than the 501mg/kg threshold, the acute oral toxicity of wastes <br /> containing sodil m cyanide can be determined using the above <br /> equation'. <br /> 'For the prposes of this illustration, it will be assumed <br /> that sodium cylnide is the only toxic constituent of concern; <br /> therefore: <br /> a %A= %A. <br />