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,. <br /> 4 - <br /> k <br /> TABLE 5 <br /> Total Threshold Limit Concentration <br /> Experimental Control TTLC STLC <br /> Element (mg/kg) (mg/kg) (mg/kg) (mg/, <br /> Antimony <1.00 <1.00 500 <br /> Barium 1.20 2.50 10,000 <br /> Beryllium 0.01 0.01 75 <br /> Cadmium <0.02 <0.02 100 <br /> Chromium VI * * . 500 <br /> Chromium 0.13 0.12 2,500 5.- <br /> (total) <br /> Cobalt <0.30 <0.30 8,000 <br /> Copper 0.08 0.08 2,500 :. <br /> Lead <0.50 <0.50 1,000 <br /> Molybdenum <0.70 <0.70 3,500 <br /> Nickel <0.20 0.25 2,000 <br /> Silver <0.02 <0.02 500 <br /> Vanadium 0.57 0.56 2,400 <br /> Zinc 0.97 0.37 5,000 2- <br /> Iron 150 120 <br /> Arsenic 0.18 0.18 500 <br /> Selenium <0.01 <0.01 100 <br /> Mercury .202 .143 20 <br /> Thallium <0.70 <0.70 700 <br /> The total chromium was less than the hexavalent limiz <br />