Abstract
Table 6Comparison between the COD values and their relative standard deviations for several organic compounds using the assisted digestion methods and the referencemethodCompound TheoreticalvalueClassical method Closed microwaves method Open microwaves method Ultrasound methodCOD(mg/L)COD(mg/L)R.S.D.(%)Recovery(%)COD(mg/L)R.S.D.(%)Recovery(%)COD(mg/L)R.S.D.(%)Recovery(%)COD(mg/L)R.S.D.(%)Recovery(%)Phenol 103.7 102.6 5.1 99 77.8 7.3 75 83.9 2.8 81 103.7 1.9 100Oxalic acid 99.7 98.0 10.6 98 99.9 5.6 100 92.8 3.2 93 99.6 0.5 100d-Glucose 102.3 102.6 5.1 100 102.0 4.2 100 101.6 2.8 99 103.0 1.9 101
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