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end of the spectrum in terms of polarity and selec-

tivity, and does not adequately resolve the primary

amines even though it has excellent stability and a

higher maximum operating temperature (315°C).

The Rtx

-35 Amine column was designed to provide

a range of polarity and selectivity that falls between

the Stabilwax

-DB and Rtx

-5 Amine columns. The

Improved Resolution of Primary Amines

Primary amines normally are analyzed on a

Stabilwax

-DB column because it has a special

deactivation that helps to easily resolve these com-

pounds. However the maximum operating tempera-

ture of this column is 220°C, which limits the

molecular weight range of the amines that can be

analyzed.The Rtx

-5 Amine column is at the other

Rtx

-35 Amine

(fused silica) Stable to 340°C

ID (mm)

df(µm)

temp. limits

15-Meter

30-Meter

0.25

0.50

0 to 290/310°C

11335

11338

1.00

0 to 280/300°C

11350

11353

0.32

1.00

0 to 280/300°C

11351

11354

1.50

0 to 270/290°C

11366

11369

0.53

1.00

0 to 260/280°C

11352

11355

3.00

0 to 240/260°C

11382

11385

Leak Detective

™

Electronic Leak

Detector

• Compact, lightweight,

hand-held design.

• Contamination-free

leak detection.

• Detects helium or

hydrogen trace leaks at

3 x 10

-4

cc/sec. or 200ppm.

• Audible alarm and LED readout.

• Responds in less than 2 seconds to trace leaks of

gases.*

• Operates on two 9-volt batteries or AC adaptor, both

included.

(110 VAC):

cat.# 21607, (ea.)

(220 VAC):

cat.# 21609, (ea.)

European 2-prong plug (220 VAC):

cat.# 21382

(ea.)

*Not designed for use in explosive atmospheres.

Many GC problems can be avoided by

electronically leak checking the system

during the plumbing process. Thorough

leak checking will prevent loss of GC

gases and reduce damage to capillary

columns, and will help decrease detector

maintenance. Oxygen can move into the

system via a leak due to the Venturi

effect, and irreversible damage can occur

if a column is exposed to oxygen at high

temperatures. Also, some detectors are

very sensitive to oxygen. Leak checking

the instrument before column installation

and conditioning prevents column degra-

dation indicated by high bleed and short

lifetime. Leak checking should be per-

formed on the entire gas system and GC.

Begin by checking all fittings inside the

GC. Next check the external fittings along

the carrier gas lines, all the way to the

gas tanks. Never use liquid leak detectors

that contain soap or surfactants because

liquids can be drawn inside the fitting at

the site of the leak and contaminate the

system.

from the

Restek Wizards

Figure 2

The Rtx

-35 Amine column offers good resolution of primary amines compared to the more

polar Stabilwax

-DB column.

Base-Deactivated Guard Columns

For analyzing basic compounds, use base-deactivated guard columns. Order cat. #s 10000

10001 , 10002

(0.25, 0.32, and 0.53mm ID respectively) for 5m

base-deativated guard

columns.

More information on guard columns can be found on page 7. For detailed pricing, refer to the

annual

Chromatography Products Guide

(lit. cat.# 59662).

New Electronic Leak Detector

Coming Soon!

Designed to be more sensitive, smaller,

and ergonomic. Watch the Restek

Advantage newsletter and

www.restekcorp.com

for details.

Base-Deactivated Inlet Liners for Agilent GCs

Description

ea.

5-pk.

25-pk.

4mm Split Straight w/Wool

20781-211.1

20782-211.5

20783-211.25

Cyclosplitter

20706-210.1

20707-210.5

—

4mm Splitless Straight

20772-210.1

20773-210.5

20774-210.25

2mm Gooseneck

20795-210.1

20796-210.5

20797-210.25

4mm Gooseneck

20798-210.1

20799-210.5

20800-210.25

If you do not see the liner you need, orders can be placed on a custom basis with the appropriate suffix number added.

For base deactivation, each (-210.1), 5-pack (-210-5), 25-pack (-210.25). For base-deactivated liners with base-deactivat-

ed wool: each (-211.1), 5-pack (-211.5), 25-pack (-211.25). For a complete list of inlet liners, refer to the annual

Chromatography Products Guide

(lit. cat.# 59662).

1.0µL direct injection of amines in water;

Oven temp.:

45°C isothermal;

Inj. & det. temp.:

250°C;

Carrier gas:

hydrogen;

Linear velocity:

40cm/sec. (flow rate: 5cc/min.);

FID sensitivity:

1 x 10

-11

AFS

min.

benefits of the Rtx

-35 Amine column include

excellent thermal stability and good resolution for

primary amines as shown in Figure 2.

Because the Rtx

-35 Amine column offers excellent

response and peak symmetry for more polar

amines and has high thermal stability, laboratories

analyzing amines and other basic compounds can

benefit from better results.

2/3

1. methylamine

2. dimethylamine

3. trimethylamine

4. ethylamine

5. isopropylamine

tert

-butylamine

7. n-propylamine

8. diethylamine

sec

-butylamine

GC_CH00578

Sample:

primary amines;

Concentration:

50ppm

on-column;

Solvent:

water;

Sample size:

1.0µL;

Inj. temp.:

250°C;

Injection mode:

split (10:1);

Inlet liner:

base-deactivated 4mm Single Gooseneck

(cat.# 20798-210.1);

Carrier gas:

helium;

Linear velocity:

35.7cm/sec.;

Detector:

FID @ 300°C;

Oven temp.:

35°C (hold 5.0 min.)

30m, 0.53mm ID, 1.0µm

Rtx

-35 Amine

(cat.# 11355)

30m, 0.53mm ID, 1.0µm

Stabilwax

-DB

(cat.# 10855)

GC_CH00304

min. 1