Markes International

Air Sampling Canisters

Air sampling canisters are used for the collection, storage, and analysis of the most volatile organic compounds, such as C2 hydrocarbons and freons. Canisters are available in stainless steel (TO-Can) and inert-coated stainless steel (SilcoCan), in volumes ranging from 1 to 15 L. These canisters are ideal for grab-sampling to determine the time-weighted average (TWA) of ambient air.

- Equipped with a three-port RAVE valve featuring a vacuum/pressure gauge (-30" Hg/60 psi).

- Supports US EPA Methods TO-14A/15.

- Compatible with Markes’ CIA Advantage-xr system.

Markes’ BioVOC-2™ breath sampler is a lightweight and simple-to-use device designed for non-invasive biological exposure monitoring of VOCs. Using a design pioneered by the UK Health & Safety Executive, BioVOC-2 collects the last 129 mL of expired breath for transfer to a sorbent tube, and subsequent analysis by thermal desorption. 

- Simple manual transfer of collected breath to industry-standard TD sorbent tube

- Non-invasive and easy to use, removing the need for medically qualified staff

- Collects the last portion of breath, largely alveolar air, which is the most reliable indicator of VOCs in the blood

- Can be used multiple times for one participant within a single sample sitting

- Disposable mouthpiece to avoid contact with the BioVOC-2 body

BioVOC-2 is for research use only. Not for use in diagnostic procedures

Read more: BioVOC-2 flyer

ACTI-VOC PLUS

ACTI-VOC PLUS™ is a robust, fast-flow sampling pump kit designed for sampling volatile organic compounds (VOCs) onto sorbent tubes for analysis via thermal desorption (TD). With an expanded flow range compared to the ACTI-VOC series, ACTI-VOC PLUS is the ideal choice for sampling semi-volatile organic compounds (SVOCs), where required sampling flows are in the range of 300–500 mL/min.

The device allows for the sampling of precise air volumes in constant-flow mode (20–500 mL/min). Long battery life ensures stable performance for over 8 hours. The pump is programmable and allows for the recording of sample data. A dedicated carry-case protects the pump from damage during storage and transport. Users can replace the filters and battery themselves to minimize downtime during maintenance.

Read more: ACTI-VOC PLUS flyer

Pumps used for active sampling include 'grab-samplers' and battery-powered pumps. By allowing precise volumes from 20 mL to several hundred liters to be sampled into tubes, this method ensures compatibility with a wide concentration range (from sub-ppt to high ppm levels).

Active sampling can be used in combination with multi-bed sorbent tubes to collect analytes over a wide volatility range; it can also be used for collecting very volatile organic compounds - VVOCs (e.g., propene and chloromethane) through to semi-volatile organic compounds - SVOCs (e.g., dodecyl phthalate and six-ring PAHs).

Re-collect 10

Easily produce ten replicate samples for advanced quality control

Re-collect 10™ is a versatile, stand-alone, off-line sample replication system for TD–GC–MS, founded on the tried-and-tested re-collection technology that we originally pioneered for our thermal desorption instruments.

Re-collect 10 revolutionises quality control by enabling the reliable generation of up to ten replicates from a single original sample. This is particularly useful for unique events like biological processes, pollution incidents and food degradation, where the number of representative samples that can be collected is very limited. It is also useful for inter-lab studies, quality control, method development, and composite sample creation.

Read more: Re-collect 10 flyer

TC-20 & TC-20 TAG

Conditioning and dry-purging units for multiple sorbent tubes

TC-20™ and TC-20 TAG™ are compact, stand-alone devices for the simultaneous conditioning or dry-purging of up to 20 thermal desorption sorbent tubes. TC-20 is used by thermal desorption–GC analysts who want to improve their laboratory’s productivity by avoiding using valuable instrument time for conditioning sorbent tubes. TC-20 TAG is a variant of the TC-20 for those who use Markes’ RFID TubeTAG tube tagging system with single-bed sorbent tubes. It is especially useful for those working to the US EPA Method 325 regulation.

Read more: TC-20 and TC-20 TAG brochure

MTS-32 (multiple-tube sampler)

The MTS-32 Multi-tube sequential sampler is a compact, robust, and portable sampler, designed for unattended sampling of air onto a series of sorbent tubes. Ambient air is pulled sequentially through a series of up to 32 industry-standard thermal desorption tubes by a low-flow sampling pump. Each tube is sampled at the same flow rate, so that the same volume of air is collected.

- Field-portable – the MTS-32 can be used virtually anywhere

- Labour-saving, unattended sampling – retrieve the instrument at the end of the extended sampling period

- Trusted sample integrity – tubes are sealed with diffusion-locking technology, preventing unwanted air ingress and sample loss

Read more: MTS-32 flyer

Micro-Chamber/Thermal Extractor

The Micro-Chamber/Thermal Extractor™ (µ-CTE™) is a versatile and compact unit with four small cylindrical chambers that enables the sampling of chemicals released from products or materials. Released volatile and semi-volatile organic compounds (VOCs and SVOCs) are collected onto sorbent tubes for analysis by TD–GC–MS. Applications range from emissions screening of construction materials, consumer products, and car trim to aroma or fragrance profiling.

- Designed for sampling VOCs or SVOCs emitted from products and materials.

- Humidifier and permeation accessories extend the capabilities of the instrument.

- A full range of accessories for the Micro-Chamber/Thermal Extractor is available.

Read more: Micro-Chamber brochure

Kori-xr

Cryogen-free water management module for online and canister samples

Kori-xr™ is a module that efficiently removes humidity from canister or on-line samples acquired using Markes International’s UNITY-xr systems, without affecting analyte recovery. It’s ideal for laboratories needing to carry out on-line or canister analysis of humid air streams while avoiding the loss of polar species, oxygenates and monoterpenes that can occur with other approaches to water management.

Read more: Water management brochure

Continuous on-line thermal desorber for environmental monitoring of trace-level organic vapors

TT24-7xr is an advanced, versatile thermal desorption (TD) instrument designed for low-flow monitoring of airborne very volatile and volatile organic compounds (VVOCs and VOCs) with GC-MS.

Optimized for continuous monitoring, TT24-7xr incorporates twin trap technology ensuring complete sample coverage without interruption and enhanced sample throughput. With advanced water management and automated stream selection between sample, standard, and blank, TT24-7xr is the ideal choice for unattended, continuous monitoring of environmental air, material testing chambers, and process gas streams.

Xem thêm: TT24-7xr brochure

Cryogen-free, automated canister and whole-air preconcentration system

UNITY–CIA Advantage-xr™ is an inert, multi-channel system designed for the automated analysis of VOCs in canisters and bags. It features capacity for up to 27 channels, operates completely without cryogen, and is compatible with both on-line and tube-based sampling. It is the ultimate solution for high-throughput laboratories performing canister-based methods such as US EPA TO-15/TO-15A and Chinese EPA HJ 759. It is also ideal for analysts requiring a versatile TD system capable of handling other whole-air samples as well as sorbent tubes.

UNITY–CIA Advantage-xr™ is also available with our award-winning Multi-Gas functionality. The Multi-Gas Enabled version is the only canister and bag thermal desorber independently certified for operation with a choice of three carrier gases: Helium, Nitrogen, and Hydrogen. Hydrogen carrier gas offers fast, cost-effective analysis and protects the laboratory against future Helium shortages.

Read more: UNITY–CIA Advantage-xr brochure

Cryogen-free automated thermal desorption system for unattended on-line air monitoring

UNITY–Air Server-xr™ is an air monitoring system that introduces a controlled flow of sample directly into an integral focusing trap, allowing automated on-line analysis of VVOCs and VOCs in air or gas. It is the ideal solution for 24/7 monitoring of volatiles such as PAMS ozone precursors and odorous species, especially in remote locations where unattended sampling at specific time intervals is necessary.

Xem thêm: UNITY–Air Server-xr brochure