What is a DB 5 column?

DB-5ms Columns Agilent J&W DB-5ms is a nonpolar phenyl arylene polymer, virtually equivalent to (5%-phenyl)-methylpolysiloxane, featuring an excellent signal-to-noise ratio for analytical applications.

What is DB in GC column?

DB-1 Columns Agilent J&W DB-1 is nonpolar and low-bleed, and operates under high temperature limits. It is an excellent choice for general purpose use in a wide variety of applications. Precision-engineered DB-1 is bonded, crosslinked and solvent rinsable, and is equivalent to USP phase G2.

What is DB 624 GC column?

Agilent J&W DB-624 is recommended for EPA methods 502.2 and 8021, as well as for fast GC/MS volatiles analysis. It is specifically designed for the analysis of volatile priority pollutants and residual solvents.

What is DB wax column?

Agilent J&W DB-WAX are high-polarity, polyethylene glycol (PEG) columns. A variety of column types are available to suit food, fragrance, and flavor applications. DB-WAX – high-polarity, polyethylene glycol (PEG) column that is ideal for food, fragrance, and flavor applications.

Which column is used in GC?

Two types of columns are used in gas chromatography: packed columns and capillary columns. Short, thick columns made of glass or stainless steel tubes, packed columns have been used since the early stages of gas chromatography.

What is a capillary column?

Capillary columns are gas chromatography (GC) columns that have the stationary phase coating their inner surfaces rather than being packed into the cavity. Capillary GC columns are used to analyze samples for the individual chemical compounds that they contain.

How do I choose the right GC column?

The selection of the proper capillary column for any application should be based on four significant factors: stationary phase, column I.D., film thickness, and column length. The practical effects of these factors on the performance of the column are discussed briefly in this section, in order of importance.

What is the principle of GC?

Principle of gas chromatography: The sample solution injected into the instrument enters a gas stream which transports the sample into a separation tube known as the “column.” (Helium or nitrogen is used as the so-called carrier gas.) The various components are separated inside the column.

What is PEG column?

GC columns with polyethylene glycol (PEG) stationary phase are widely used for analyzing compounds with polar functional groups. PEG phase demonstrates a unique separation mechanism based on hydrogen bonding, and acid-base interaction, making it suitable for many industrial applications.

How long does a GC column last?

A related question that we hear quite often is “what is the shelf life of a capillary GC column.” Once again, there are no right or wrong answers and GC columns usually don’t ship with an expiration date on them – but in general, a pretty good guideline guide line is to use the column within about two years to ensure …

What is a plot column?

PLOT columns generally are made by conglomerates of particles that are deposited as a layer inside of the capillary. The layer is porous, meaning that the gas pressure inside the column also will be present between the individual particles.

What are the specs for the DB 5 column?

DB-5 is also bonded, cross-linked and solvent-rinsable and has a high temperature limit. It is equivalent to USP phase G27. The DB-5 column is tested with the tightest industry QC specifications for column bleed, sensitivity, and efficiency.

Are there DB-5 columns in Agilent J & W?

DB-5 Columns Agilent J&W DB-5 is nonpolar and low bleed, and is available in a range of column dimensions. DB-5 is also bonded, crosslinked, and solvent-rinsable, and has a high temperature limit. It is equivalent to USP phase G27.

Is the DB-5 column equivalent to phase G27?

DB-5 is also bonded, crosslinked, and solvent-rinsable, and has a high temperature limit. It is equivalent to USP phase G27. The DB-5 column is tested with the tightest industry QC specifications for column bleed, sensitivity, and efficiency. Items were successfully added to your cart!

What is the difference between column oriented and row oriented DBMS?

A column-oriented DBMS or columnar DBMS is a database management system (DBMS) that stores data tables by column rather than by row. Practical use of a column store versus a row store differs little in the relational DBMS world. Both columnar and row databases can use traditional database query languages like SQL to load data and perform queries.