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8 • • <br />TABLE 3. - Chemically bound water, C02, and noncarbonate carbon in U.S. cement kiln <br />dust, wt-pct-Continued <br /> <br />Sample Chemically <br />bound <br />water <br />C02 Noncar- <br />bonate <br />carbon <br />Sample Chemically <br />bound <br />water <br />C02 Noncar- <br />bonate <br />carbon <br />91 1.8 12.0 0.15 103 2.8 22.4 0.18 <br />92 1.2 27.0 .17 104 1.3 25.1 .86 <br />93 1.8 19.1 .25 l05 1.2 26.6 .23 <br />94 .9 15.4 .15 106 1.4 23.0 .21 <br />95 1.3 20.6 .06 107 1.0 31.7 .56 <br />96 1.3 24.0 .23 108 2.4 4.4 .34 <br />97 1.7 23.8 .11 109 3.0 21.9 .70 <br />98 1.9 23.8 .13 110 1.4 20.5 1.23 <br />99 1.1 33.3 .44 111 .5 31.5 .44 <br />100 1.3 23.3 .I1 112 .9 23.7 .33 <br />101 1.0 21.8 .24 l13 .8 8.2 .45 <br />102 7.7 8.7 .64 <br />ND Not determined. <br />lAnalysis by J. V. Scales , chemist, Avondale Research Center, Bureau of Mines, <br />Avondale, Md. <br />Noncarbonate carbon was determined <br />by treating a weighed sample with dilute <br />HCl and heating to dissolve the carbon- <br />ate minerals present (calcite, dolo- <br />mite.) After evolution of C02 ceased, <br />the samples were rinsed to remove excess <br />acid and analyzed by a LECO carbon ana~ <br />lyzer. Noncarbonate carbon is generally <br />unburned coal or fuel oil in the CKD <br />samples. The concentrations as shown in <br />cable 3 ranged From <0.01 co 1.83 <br />'wc-pct. <br />Anions <br />The anion species present in the CKD <br />samples were determined using a Dionex <br />10 ion chromatograph. The CKD samples <br />were weighed and then fused with <br />Na2C03. After fusion, the samples <br />were leached with hLgh purity deionized <br />distilled water and diluted to a stand- <br />ard concentration; and aliquots of a <br />L-co-IO dilution were injected into the <br />ion chromatograph. <br />Details of this procedure are given <br />elsewhere (7). Determinations of chlo- <br />ride (CL-), fluoride (F-), nitrate <br />(N03-), phosphate (P043-), and <br />sulfate (5042-) were obtained from <br />a single sample injection. The results <br />of these determinations on the U. S. CKD <br />samples are presented in tab Le 4. Chlo- <br />ride ranged Erom <0.01 to 12.3 wt-pct, <br />Fluoride from O.OL to 0.60 wt-pct, <br />nitrate from <0.02 to L.67 wt-pct, phos- <br />phate from <0.02 to O.I6 we-pct, and <br />sulfate Erom 0.41 to 31.6 wt-pct. Bro- <br />mide (Br ) and nitrite (N02-) can <br />also be determined by this method Erom <br />the same injection of solution, but no <br />samples were found co contain either <br />Br- or N02- at levels greater than <br />the detection limit (<0.02 wt-pct) for <br />these anions. <br />Major, Minor, and Trace Elements <br />The elements A1, Si, K, Ca, Ti, a~ <br />Fe were determined for the majority of <br />samples by a fused~iisk fiuorescen[ <br />X-ray speccrography procedure. Fifteen <br />CKD samples were analyzed Eoc the above <br />elements by wet chemical techniques, and <br />Chese samples were used as secondary <br />standards Eor the X-ray method. Ocher <br />major, minor, and trace elements were <br />determined by flame atomic absorption <br />spectroscopy (AAS). Samples were <br />