Carbon Nanotube Integrative Sampler (CNIS) for passive sampling of nanosilver in the aquatic environment

Abstract

8 Nanomaterials such as nanosilver (AgNP) can be released into the aquatic environment through 9 production, usage, and disposal. Sensitive and cost-effective methods are needed to monitor 10 AgNPs in the environment. This work is hampered by a lack of sensitive methods to detect 11 nanomaterials in environmental matrixes. The present study focused on the development, 12 calibration and application of a passive sampling technique for detecting AgNPs in aquatic 13 matrixes. A Carbon Nanotube Integrative Sampler (CNIS) was developed using multi-walled 14 carbon nanotubes (CNTs) as the sorbent for accumulating AgNPs and other Ag species from 15 water. Sampling rates were determined in the laboratory for different sampler configurations and 16 in different aquatic matrixes. The sampler was field tested at the Experimental Lakes Area, 17Canada, in lake water dosed with AgNPs. For a configuration of the CNIS consisting of CNTs 18 bound to carbon fibre (i.e CNT veil) placed in Chemcatcher® housing, the time weighted average 19 (TWA) concentrations of silver estimated from deployments of the sampler in lake mesocosms 20 dosed with AgNPs were similar to the measured concentrations of "colloidal silver" (i.e. <0.22 µm 21 in size) in the water column. For a configuration of CNIS consisting of CNTs in loose powder 22 form placed in a custom made housing that were deployed in a whole lake dosed with AgNPs, the 23 estimated TWA concentrations of "CNIS-labile Ag" were similar to the concentrations of total 24 silver measured in the epilimnion of the lake. However, sampling rates for the CNIS in various 25

Improved single particle ICP-MS characterization of silver nanoparticles at environmentally relevant concentrations

“…station D3). Studies describing the use of passive sampling devices to monitor silver at this location were previously described by Shen et al 14 Samples were collected at site D3 in July and August, 2014 and in May and August, 2015. Samples were ash frozen in liquid nitrogen in 5 mL polypropylene (PP) cryogenic vials to preserve the particle size distribution, as described previously by Furtado et al 15 and were stored in an ultra-low temperature freezer at À80 C until thawed for analysis.…”

SWM and urban water: Smart management for an absurd system?

“…For instance, substances that interrupt hormones in fish populations result in feminization of fish downstream of urban wastewater treatment plants in Canada and elsewhere (Hamid & Eskicioglu, 2012;Kidd et al, 2007); but the long-term implications for ecosystems are unknown (Marcogliese et al, 2015). New contaminants continue to emerge, in particular from nanotechnologies and industrial chemicals (Shen et al, 2016).…”

Accumulation of Silver in Yellow Perch (Perca flavescens) and Northern Pike (Esox lucius) From a Lake Dosed with Nanosilver

“…NH2-CNT) sandwiched between cellulose acetate (0.8 µm) membranes. 31 For the DGT samplers, the materials used to construct the samplers were purchased from DGT Research (Lancaster, UK) and consisted of a plastic housing with a surface area of 3.14 cm 2 , a receiving phase of Chelex resin (25 mm diameter) and a diffusive gel (2-5 nm pore size) covered with a 0.45 μm pore size polysulfone membrane (0.14 mm thickness). 31 For each monitoring period of 4-7 weeks, 3 of the CNIS samplers and 3 of the DGT samplers were deployed together in stainless steel cages.…”