Vertical Distribution of Nonylphenol Ethoxylates a

Authors: Fusheng Li Jun Tsumori Yutaka Suzuki Hiroaki Tanaka

Publish Date: 2007/11/25

Volume: 189, Issue: 1-4, Pages: 265-277

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Abstract

The distribution of nonylphenol ethoxylates NPEOn and their derivatives of nonylphenol NP and nonylphenoxy ethoxy acetic acids NPEnC in the sediments of a relatively closed freshwater reservoir was investigated using sediment layers sliced from undisturbed sediment cores collected with a gravity core sampler at three sampling sites St 1 St 2 and St 3 along the water flow direction The relationships between the bound content of these compounds and the sediment organic matter as well as the likely transformation pathways were evaluated The total content of NPEOn n = 1–15 fell in 846–3365 599–1355 and 770–6234 μg/kgdry for all sliced layers at St1 St2 and St3 respectively with the content of individual NPEOn species showing a general decreasing trend with the attached molar number of the ethoxy EO chain Compared to each detected NPEOn species the bound content of NP was much higher falling in 732–2484 799–3582 and 255–19884 μg/kgdry at St 1 St 2 and St 3 respectively A general increasing trend of the NP content along the water flow direction of the reservoir was revealed NPEnC n = 1–10 varied in 193–412 285–984 and 105–191 μg/kgdry for sediment at the respective site of St 1 St 2 and St 3 with the averaged values at these sites 291 471 and 672 μg/kgdry showing an increasing trend from the upstream to the downstream For NPEnC a parametric trend of increases in the content of NPE1C NPE2C and NPE3C with the bound sediment organic matter 906–118 seemed to be existent Furthermore the computed magnitudes of NPEO1–2/NPEO1–15 NP/NPEO1–15 and NPEC1–10/NPEO1–15 suggested that nonoxidative hydrolytic transformation was probably prevailing within the sedimented mud phase of the reservoir with the oxidative hydrolytic transformation pathway being less involved

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