Synthetic musks (SMs) are ubiquitous contaminants in the environment. Occurrence and spatial distribution of SMs in 16 surface sediments collected from Liangtan river (Chongqing, west China) were investigated using gas chromatography-mass spectrometry. Four SMs, galaxolide (HHCB), tonalide (AHTN), musk xylene, and musk ketone, were detected in sediment samples. Total concentrations of SMs ranged from limit of quantification to 364.48 μg/kg (dry weight, dw). Two polycyclic musks, HHCB and AHTN, were dominant components in sediments and ranged from limit of quantification ∼268.49 μg/kg dw, 0–99.75 μg/kg dw, respectively. Composition profiles and ratios of HHCB/AHTN generally reflect the spatial distribution in the sediments, and from upstream to downstream, the concentrations gradually increased, then gradually reduced. This is consistent with the use pattern of SMs by personal care products in the Liangtan River region. SM concentrations were relatively higher when compared with those reported in the literature. This could be a result of discharge of untreated municipal wastewater.
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