Abstract Fish and sediments from several places along the Swedish River Viskan, sampled in 1995, were analyzed for polybrominated diphenyl ethers (PBDEs) hexabromocyclododecane (HBCD). The samples collected up- downstream possible point sources (textile industries) these compounds. Tetrabromodiphenyl (TeBDEs), pentabromodiphenyl (PeBDEs), decabromodiphenyl ether (DeBDE [BDE209]) found sediment. PeBDEs also fish. Hexabromocyclododecane was identified sediment Large fish to ratios TeBDE,...

Dietary uptake and effects of decabromodiphenyl ether (DeBDE), a widely used flame retardant, were studied in rainbow trout. Fish fed for 16, 49, or 120 days with control DeBDE-treated food (7.5−10 mg DeBDE/kg body weight/day). One group was DeBDE 49 then diet 71 to study depuration. Chemical analyses performed using GC/MS(ECNI). Several physiological biochemical variables also measured. concentrations muscle increased from <0.6 ng/g fresh weight 38 (±14) after days. Corresponding liver <5...

The brominated flame retardant decabromodiphenyl ethane, DeBDethane, is marketed as an alternative to ether, BDE209. There are currently no data available about the presence of DeBDethane in environment. In this study, was positively identified by high-resolution mass spectrometry and quantified low-resolution with electron capture negative ionization sewage sludge, sediment, indoor air. It found 25 50 Swedish treatment plants investigated, estimated levels up 100 ng/g dry weight....

Guillemot eggs from the Baltic Sea, sampled between 1969 and 2001, were analyzed for tetra- pentabromodiphenyl ethers (2,2',4,4'-tetraBDE (BDE-47), 2,2',4,4',5-pentaBDE (BDE-99), 2,2',4,4',6-pentaBDE (BDE-100)), hexabromocyclododecane (HBCD). This temporal trend study indicates that concentrations of polybrominated diphenyl ether compounds increased 1970s to 1980s, peaking around mid- late-1980s. These peaks are then followed by a rapid decrease in concentra tions during rest period, with...

Decamethylcyclopentasiloxane (D(5)) is a volatile compound used in personal care products that released to the atmosphere large quantities. Although D(5) currently under consideration for regulation, there have been no field investigations of its atmospheric fate. We employed recently developed, quality assured method measure concentration ambient air at rural site Sweden. The samples were collected with daily resolution between January and June 2009. ranged from 0.3 9 ng m(-3), which 1-3...

Cyclic volatile methyl siloxanes (cVMS) are present in technical applications and personal care products. They predicted to undergo long-range atmospheric transport, but measurements of cVMS remote areas remain scarce. An active air sampling method for decamethylcyclopentasiloxane (D5) was further evaluated include hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), dodecamethylcyclohexasiloxane (D6). Air samples were collected at the Zeppelin observatory Arctic (79° N, 12°...

Acoustic wave propagation in flow ducts is commonly modeled with time-domain non-linear Navier–Stokes equation methodologies. To reduce computational effort, investigations of a linearized approach frequency domain are carried out. Calculations sound straight duct presented an orifice plate and mean present. Results transmission reflections at the on two-port scattering matrix form compared to measurements good agreement. The methodology. This methodology found be efficient for cases where...

The biomagnification of the cyclic volatile methyl siloxanes octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexatetrasiloxane (D6) was analyzed in Lake Mjøsa food web Norway from zooplankton Mysis to planktivorous piscivorous fish. trophic magnification factor (TMF) for D5 determined compared with TMFs several legacy contaminants: polychlorinated biphenyl (PCB) congeners 153 180, polybrominated diphenyl ether (PBDE) 47 99, p,p′-DDE. showed TMF...

Cyclic volatile methyl siloxanes (cVMS) concentrations were analyzed in the pelagic food web of two Norwegian lakes (Mjøsa, Randsfjorden), and brown trout (Salmo trutta) Arctic char (Salvelinus alpinus) collected a reference lake (Femunden), 2012. Lakes receiving discharge from wastewater treatment plants (Mjøsa Randsfjorden) had cVMS that up to 2 orders magnitude higher than those Femunden, where most samples close limit quantification (LOQ). Food biomagnification Mjøsa Randsfjorden was...

Cyclic volatile methylsiloxanes are being subjected to regulatory scrutiny as possible PBT chemicals. The investigation of bioaccumulation has yielded apparently contradictory results, with high laboratory fish bioconcentration factors on the one hand and low field trophic magnification other. In this study, octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6) were studied along polychlorinated biphenyls (PCBs) in sediments, ragworm,...

Tens of thousands tonnes cyclic volatile methylsiloxanes (cVMS) are used each year globally, which leads to high and continuous cVMS emissions air. However, field measurements in air empirical information about emission rates still limited. Here we present decamethylcyclopentasiloxane (D5) dodecamethylcyclohexasiloxane (D6) for Zurich, Switzerland. The were performed January February 2011 over a period eight days at two sites (city center background) with temporal resolution 6-12 h....

Dietary intake studies of lower brominated diphenyl ethers (BDEs) have shown that fish and animal products are important vectors human exposure, but almost no data exist for higher BDEs. Therefore, the fate hepta- to decaBDEs was studied in lactating cows exposed a naturally contaminated diet by analyzing feed, feces, milk samples from previous mass balance study PCB. Tissue distribution one cow slaughtered after experiment. BDE-209 dominant congener organs, adipose tissues, not milk. In...

Decabromodiphenyl ethane (DBDPE) is a brominated flame retardant (BFR) used as replacement for the structurally similar decabromodiphenyl ether (decaBDE), which regulated environmental contaminant of concern. DBDPE has been found in indoor dust, sewage sludge, sediment, and biota, but little known about its occurrence distribution environment. In this paper, sediment was analyzed from 11 isolated Swedish lakes along transect running central Stockholm through archipelago to Baltic Sea....

A number of volatile methylsiloxanes have been identified as environmental contaminants and several are currently the subject detailed risk assessments due to concerns that they may be persistent, bioaccumulative toxic in environment. Once emitted these chemicals reside primarily atmosphere. Consequently, knowledge their concentrations air is essential understanding fate environment any potential adverse impacts. We developed a method analyse 4 cyclic (D3, D4, D5 D6) linear (L3, L4, L5 L6)...

It is challenging to measure the persistence of chemicals under field conditions. In this work, two approaches for measuring in were compared: chemical mass balance approach, and a novel benchmarking approach. Ten pharmaceuticals, an X-ray contrast agent, artificial sweetener studied Swedish lake. Acesulfame K was selected as benchmark quantify using The 95% confidence intervals half-life transformation lake system ranged from 780-5700 days carbamazepine <1-2 ketoprofen. estimates obtained...

The three cyclic volatile methylsiloxanes (cVMS), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6), are recently identified environmental contaminants. Methods for the trace analysis of these chemicals in matrices required. A purge trap method to prepare highly purified sample extracts with a low risk contamination is presented. Without prior homogenization, heated water, cVMS purged from slurry trapped on an Isolute ENV+ cartridge....