{'fraction_non_alphanumeric': 0.022058823529411766, 'fraction_numerical': 0.02100840336134454, 'mean_word_length': 5.228758169934641, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Voltammetric determination of airborne 2-chloronitrobenzene using a recirculating absorbent vapour sampler.

A system designed to pre-concentrate atmospheric vapour samples into a recirculating absorbent and which is suitable for direct voltammetric analysis is described. A Meinhard nebuliser operates as a venturi pump to allow circulation and dispersion of the absorbent into a fine aerosol, suitable for efficient collection of vapour samples. The incoming gas phase drives the nebuliser from which the mixed aerosol-vapour sample is condensed in a length of glass tubing. The pre-concentrated sample is circulated through an electrochemical cell for voltammetric detection at a hanging mercury drop electrode. The optimum electrochemical conditions for the determination of test atmospheres containing 2-chloronitrobenzene at levels of 1.5–4.3 × 10–4 g m–3 for sampling periods of between 30 and 813 s at a flow-rate of 0.18 dm3 s–1 are described.