Cyclic volatile methyl siloxanes (D4, D5, and D6) as the emerging pollutants in environment: environmental distribution, fate, and toxicological assessmentsCyclic volatile methyl siloxanesEnvironmental behaviorToxicityPartitioning coefficientBioaccumulation...
Three of them are cyclic siloxanes (D4, D5 and D6) which are mainly used in cosmetics and personal care products2. Moreover, the European Commission published restriction of D4 and D5 under REACH Annex XVII Entry 70 (Regulation (...
Concentrations of D3 and D4 are significantly correlated, as are D5 and D6, which suggests different sources for these two pairs of compounds. Elevated concentrations of D3 and D4 on the West coast of North America and at high elevation sites suggest these sites are influenced by trans-...
The three cVMS evaluated were octamethylcyclotetrasiloxane (D4; CAS No. 556-67-2), decamethylcyclopentasiloxane (D5; CAS No. 541-02-6) and dodecamethylcyclohexasiloxane (D6; CAS No. 540-97-6). 2. Experimental 2.1. Study area The study area was located in the Oslofjord, Norway (Fig. ...
D3, D4, D5 and D6 were found in 0.8%, 4.8%, 14.3%, and 9.1% of the products, respectively. D5 was the most predominant cVMS with the highest concentration of 680 mg/g in an antiperspirant. D5 was also found to have the highest concentration in baby products (150 mg/g in a ...
Due to their prevalence and chemical characteristics, cyclic siloxanes are being assessed as possible persistent organic pollutants. D4, D5, and D6 were measured in indoor and outdoor air to quantify and compare siloxane concentrations and compound ratios depending on location type. Indoor air ...
The most common cyclic siloxanes are octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6), while the most common linear siloxanes are high molecular weight polydimethylsiloxanes (PDMS) and low molecular weight volatile linear siloxanes known as ...
Comprehensive studies on emerging contaminants like volatile methyl siloxanes in settled dust from different micro-environments are still limited. In this study, concentrations and distribution of cyclic volatile methyl siloxanes (CVMSs) including D3, D4, D5, and D6 were exam...
In 306 soil samples from this oilfield, the mean concentrations (43.4-125 ng/g dw) and the detection frequencies (65-76%) of D4 D6 were 10.9-11.9 and 2.05-2.24 times higher than those in reference soil samples, respectively. The concentrations of total cyclic siloxanes (Sig...
At t=90 min a sharp increase of the D4/D5 concentration in end-exhaled air was observed. We attribute this increase to inhalation of the substances during a toilet visit for collection of a urine sample. When this visit was removed from the protocol the sharp increase disappeared. Overall,...