Chemically modified halloysite nanotubes as a solid-phase microextraction coating.

Chemically modified halloysite nanotubes as a solid-phase microextraction coating.

Analytica chimica acta (2017-03-30)

Mohammad Saraji, Mohammad Taghi Jafari, Mehdi Mossaddegh

ABSTRACT

Halloysite nanotubes were modified in three simple steps including etching, hydroxylation and amino grafting. The sol-gel technique was used for the chemical bonding of the modified halloysite nanotubes (MHNTs) to fused-silica support. The MHNTs, as a novel adsorbent was applied as a SPME coating. Diazinon, parathion and fenthion were selected as the model compounds to study the extraction efficiency of the coating. Gas chromatography-corona discharge ion mobility spectrometry was applied for the analysis of the extracted analytes. The parameters influencing the extraction efficiency of the method, such as stirring rate, salt effect, extraction temperature and time were optimized. The results showed that the MHNTs fiber had better extraction efficiency than the commercial SPME (PA, PDMS, and PDMS-DVB), bare silica, silica-based HNTs and HNTs-titanium dioxide fibers. The limits of detection were found to be in the range of 0.01-0.03 μg L

MATERIALS

Product Number

Brand

Product Description

57902-U

Supelco

SPME Fiber Assembly, 65 μm PDMS/DVB, Metal Alloy (1 cm), needle size 23 ga, Autosampler, pk of 1, pink hub

57906-U

Supelco

SPME Fiber Assembly, 85 μm CAR/PDMS, Metal Alloy (1 cm), needle size 23 ga, Autosampler, pk of 1, light blue hub

57912-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, Metal Alloy (1cm), needle size 23 ga, Autosampler, pk of, plain gray hub

57355-U

Supelco

SPME Fiber Assembly, 60 μm PEG, Metal Alloy (1 cm), needle size 23 ga, Manual Holder, pk of 3, purple hub

57354-U

Supelco

SPME Fiber Assembly, 60 μm PEG, Metal Alloy (1 cm), needle size 23 ga, Autosampler, pk of 3, purple hub

57928-U

Supelco

SPME Fiber Assembly, 100 μm PDMS, Metal Alloy (1 cm), needle size 23 ga, Autosampler, pk of 1, red hub

57291-U

Supelco

SPME Fiber Assembly, 7 μm PDMS, Fused Silica (1 cm), needle size 23 ga, Autosampler, pk of 3, green hub

57293-U

Supelco

SPME Fiber Assembly, 65 μm PDMS/DVB, StableFlex (1 cm), needle size 23 ga, Autosampler, pk of 3, pink hub

57294-U

Supelco

SPME Fiber Assembly, 85 μm Polyacrylate, Fused Silica (1 cm), needle size 23 ga, Autosampler, pk of 3, white hub

57344-U

Supelco

SPME Fiber Assembly, 75 μm CAR/PDMS, Fused Silica (1 cm), needle size 23 ga, Manual Holder, pk of 3, black hub

57335-U

Supelco

SPME Fiber Assembly, 85 μm CAR/PDMS, StableFlex (1 cm), needle size 24 ga, Autosampler, pk of 3, light blue hub

57295-U

Supelco

SPME Fiber Assembly, 85 μm CAR/PDMS, StableFlex (1 cm), needle size 23 ga, Autosampler, pk of 3, light blue hub

57298-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (1 cm), needle size 23 ga, Autosampler, pk of 3, plain gray hub

57328-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (1cm), needle size 24 ga, Manual Holder, pk of 3, plain gray hub

57299-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (2cm), needle size 23 ga, Autosampler, pk of 3, notched gray hub

57302

Supelco

SPME Fiber Assembly, 7 μm PDMS, Fused Silica (1 cm), needle size 24 ga, Manual Holder, pk of 3, green hub

57308

Supelco

SPME Fiber Assembly, 30 μm PDMS, Fused Silica (1 cm), needle size 24 ga, Manual Holder, pk of 3, yellow hub

57305

Supelco

SPME Fiber Assembly, 85 μm Polyacrylate, Fused Silica (1 cm), needle size 24 ga, Autosampler, pk of 3, white hub

57334-U

Supelco

SPME Fiber Assembly, 85 μm CAR/PDMS, StableFlex (1 cm), needle size 24 ga, Manual Holder, pk of 3, light blue hub

504831

Supelco

SPME Portable Field Sampler, coating CAR/PDMS

57345-U

Supelco

SPME Fiber Assembly, 65 μm PDMS/DVB, Fused Silica (1 cm), needle size 23 ga, Autosampler, pk of 3, blue hub

57357-U

Supelco

SPME Sampling Stand, for use with 15 mL vials

57346-U

Supelco

SPME Fiber Assembly, 65 μm PDMS/DVB, Fused Silica (1 cm), needle size 23 ga, Manual Holder, pk of 3, blue hub

57311

Supelco

SPME Fiber Assembly, 65 μm PDMS/DVB, Fused Silica (1 cm), needle size 24 ga, Autosampler, pk of 3, blue hub

504823

Supelco

SPME Portable Field Sampler, coating PDMS

57300-U

Supelco

SPME Fiber Assembly, 100 μm PDMS, Fused Silica (1 cm), needle size 24 ga, Manual Holder, pk of 3, red hub

57326-U

Supelco

SPME Fiber Assembly, 65 μm PDMS/DVB, StableFlex (1 cm), needle size 24 ga, Manual Holder, pk of 3, pink hub

57348-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (2cm), needle size 24 ga, Autosampler, pk of 3, notched gray hub

57329-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (1 cm), needle size 24 ga, Autosampler, pk of 3, plain gray hub

57303

Supelco

SPME Fiber Assembly, 7 μm PDMS, Fused Silica (1 cm), needle size 24 ga, Autosampler, pk of 3, green hub