Mono TrapTM

What is Mono Trap^TM

Mono Trap^TM is an adsorptive made mainly of high-purity silica. The product features a through-pore (due to the monolith structure (Mesopore) of the silica base) and a large surface (due to the pores within the silica frame).
Mono Trap^TM is available in two types, one that has the same characteristics as general silica gel and one whose silica frame contains an adsorption medium (activated carbon). The silica frame of both types is linked with ODS groups by chemical bond and is inactivated to become collection medium.

Mono Trap^TM can be viewed as a new hybrid adsorptive having a large surface area and possessing the features of silica gel, activated carbon and the ODS group. Mono Trap^TM is available in two configurations, a disk type and a rod type.

ummary of sampling and extraction by Mono Trap^TM

Most SPME fiber kits currently available on the market contain PDMS (poly dimethy lsiloxane),PDMS/DVB (diviny lbenzene) or carbon.
It is reported that these SPME its have small surface areas and small trapping capacity, with Recovery rate of a few percent to 30 percent. In addition, their thick PDMS coat, which helps in sampling, requires contains considerable time to obtain vapor-liquid equilibrium or liquid-liquid equilibrium, thereby extending the sampling time and causing the efficiency to deteriorate.
Compared with these, Mono Trap^TM has higher efficiency as shown below, with high trapping ability, requiring only a short time for sampling (at the time of vapor sampling in a hermetically sealed vial). This high level of efficiency is due to:

1. A large surface area of 150m2/g or more, thanks to its monolithic structure;
2. Activated carbon present inside and outside the frame; and
3. ODS groups chemically bonded to its surface.

These factors work in unison to provide a high level of efficiency.

Sampling and extraction by Mono Trap^TM 

When sample passes through the through-pores in a monolithic structure, the sample is trapped by ODS groups chemically bonded to the surface of the silica structure or by activated carbon present inside and outside the structure.
Such trapping is performed all over the large surface area of at least 150m2/g, which allows a high level of efficiency.

Illustration of sampling by Mono Trap^TM

One of the advantages of a monolithic structure is that the through-pores significantly reduce the resistance of the flow path. Therefore, the extraction solvent can be easily diffused throughout the entire structure and can effectively come into contact with ODS groups or activated carbon, so that the sampling and extraction take less time. Moreover, the large surface area ensures the trapping of larger amount of sample, which is another characteristic of Mono Trap^TM . Therefore, good measurement sensitivity can be obtained despite dilution due to solvent extraction.

Extraction (desorption of sample)

Likewise, when extracting the solvent, the full amount of the solvent enters the through-pores and remains in contact with the entire surface to create speedy desorption of the sample. Only a small amount of solvent allows almost complete desorption.

Mono Trap^TM DCC 18

Disk type with a diameter of approximately 10mm and a thickness of 1mm, containing ODS groups and carbon; this type has large section area, enabling trapping of a large amount of sample ( 50 pieces contained in a set ).

Mono Trap^TM RCC 18

Rod type with a diameter of approximately 2.9mm and a height of 5mm and inside diameter of 1mm, containing ODS groups and activated carbon; this type is intended for screening analysis and for a high-concentration sample (50 pieces in a set).

The rod type does not require any dedicated extraction can be performed using an insert (Cat.No. 1030-41403) for an automatic sampler. In the case of an automatic sampler that allows the angle at which the needle is inserted into the vial to be adjusted, the analysis can be performed without changing bottles (50 pieces in a set).
(The angle at which the needle is inserted should be adjusted at least 6 mm from the lowest position.)

Mono Trap^TM DSC 18

Disk type with a diameter of approximately 10 mm and a thickness of 1mm, not containing activated carbon (50 pieces in a set)

Mono Trap^TM RSC 18

Rod type with a diameter of approximetaly 2.9 mm and a height of 5 mm and with a through hole of 1 mm, not containing activated carbon (50 pieces in a set)

Please contact us for more information.