Behaviour of chloroform from pulp bleaching in an ice-covered finnish lake

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Abstract

Samples of ice and water from different depths were collected from various parts of Lake Näsijärvi, Finland. Chloroform was analysed by liquid-liquid extraction, capillary gas chromatography followed by electron capture detection and confirmation by gas chromatography/mass spectrometry. Maps of the regional variation of chloroform and sodium-lignin sulfonates (NaLS) show that under winter conditions with an inverse stratification the effluents of a pulp mill containing chloroform and NaLS fill the depressions of the lake bottom and flow as a thin, high-density waste water current downslope northeastward against the southward directed upper current of the epilimnion. Plots of chloroform against Ca indicate that there is only a weak net removal of chloroform from combined solution and suspension. Thus mass transfer to the atmosphere is confined in Lake Näsijärvi to seasons with vertical mixing of the water masses. © 1986.

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Pecher, K., & Herrmann, R. (1986). Behaviour of chloroform from pulp bleaching in an ice-covered finnish lake. Science of the Total Environment, The, 48(1–2), 123–132. https://doi.org/10.1016/0048-9697(86)90158-0

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