Determination of chlorine and bromine in automotive shredder residues by oxygen bomb and ion chromatography
An analytical procedure, oxygen bomb combustion-ion chromatography (IC), has been developed for the determination of total chlorine in Automotive Shredder Residues (ASR). Samples of these residues are fired under elevated oxygen pressure (30 atm) and the combustion products are transferred into a Na2 CO3/NaHCO3 absorbent solution containing 1% of H2 O2; the chlorine contents are then evaluated by ion chromatography. The use of the non-suppressed IC determination with a conductivity detector provides a rapid, sensitive and selective method for chlorine determination in ASR, allowing determinations of this heteroatom at levels below 1% in the presence of bromine and sulfur. Moreover, the proposed method allows the simultaneous determination of chlorine, bromine and sulfur which are potential environmental hazards.
Elemental analysis of chemical wastes by oxygen bomb combustion-ion chromatography
Abstract The oxygen combustion bomb-ion chromatography was applied for the analysis of F, Cl, Br, P and S in organic compounds and hazardous wastes using non-suppressed ion chromatography (IC) with indirect photometric detection. A large quantity of CO 2 generated during combustion was found to give high levels of carbonate in the sample solution, cause baseline disturbance for IC determination, and give rise to interference for the determination of F − , Cl − and Br − at μg/ml level. The pre-treatment of the absorption solution using ion-exchange resin (H + -form) was shown to remove the carbonate interference while retaining the analyte anions with over 96% recoveries. The determination of low levels of bromide (2 μg/ml) was affected significantly by the presence of nitrate (>25 μg/ml). A large variety of chemical wastes had been analysed using the analytical procedure developed and the reliability of the method was established by parallel method comparison. With linear ranges up to 3 orders of magnitudes and detection limits at sub-μg/ml level, the method developed was found to be applicable for all the wastes encountered except those with high nitrate and low bromide content.
Comparison of ion chromatography and titrimetry for determination of sulfur in fuel oils
A comparison was made of Parr bomb ion chromatographic and titrimetric methods to determine sulfur in fuel oils. The two methods are comparable in precision and accuracy. When rapid sulfur determination in a number of samples is desired, the titrimetry method appears to be an appropriate choice between the two methods. l3 tables.