Agilent Technologies MP-AES Guida

Agilent MP-AES Easy Fit Torch Maintenance

To help you achieve the maximum usable life from all models of the MP-AES Easy Fit torch, it is

recommended that the cleaning procedures are followed as soon as any discoloration appears

on the outer tube of the torch. To maximize torch lifetime and prevent contamination, you

should inspect the condition and cleanliness of the torch daily.

This document is also available in other languages on the Agilent website at www.agilent.com.

CAUTION

To prevent damage to the torch, always take care when handling or storing it.

Do not use cleaning wire or abrasives like brushes or a scourer to clean the torch.

To prevent potential damage to the instrument, do not use the torch if it is damaged.

WARNING

Hot Surface and Chemical Hazard

The torch and torch compartment become extremely hot during instrument operation

and remain hot for some time after the instrument has been switched off. Allow the

torch and torch compartment to cool for at least five minutes before attempting to

remove the torch.

Nitric acid, hydrochloric acid and strong alkali solutions are very corrosive and can

cause severe burns when they come into contact with the skin. Preparation of acid soak

solutions and any soaking should be done under an extraction fume hood. It is essential

that appropriate protective clothing be worn at all times when handling these acids. If

acid contacts the skin, wash off with copious amounts of water and seek medical

attention immediately.

IMPORTANT Use a clean, wide diameter, open-top beaker (preferably 100mL tall form) or a similar container

to hold the soak solutions. Use the recommended torch cleaning stand (see Figure 1) for Easy-

fit MP-AES torches (part number G8003-68003) to hold the torch inverted while soaking during

the cleaning process. Use clean/particle free detergents or acid to perform the soak.

The torch cleaning stand aids in cleaning the torch, preventing damage to the fragile end of the

quartz outer tube and limiting exposure of the elastomer materials on the torch body to acid

fumes, reducing premature degradation.

Ensure the acid does not contact the seal between the quartz outer tube and the plastic base.

Keep the torch vertical, with the ball joint at the top, throughout all cleaning and rinsing steps

unless otherwise directed.

Cleaning the torch

2 Agilent MP-AES Easy Fit Torch Maintenance

Cleaning the torch

Follow the steps below to remove any organic residue prior to the acid soak procedure. If the

torch has not been used with organic solvents, skip these steps and go to section "Acid soak

cleaning procedure" starting at the end of this page.

Removing organic residue

To remove any organic residue prior to acid soak:

1Prepare a 5% v/v alkaline detergent solution in a wide diameter open beaker.

2Place the beaker containing the detergent solution under the torch cleaning stand.

3Place the torch in the detergent solution through the hole provided in the torch cleaning

stand as shown in Figure 1.

Figure 1. Place the quartz outer tube and injector in the detergent solution

4Ensure the quartz outer tube and the injector are immersed in the detergent as shown in

Figure 2, and then soak the torch in the detergent solution for 2 hours.

Figure 2. Ensure that the injector and outer tube are immersed and soaking in the detergent solution

5Rinse the torch by following the steps outlined in “Rinsing the Torch” on Page 3. Ensure that

all the detergent solution is washed away.

6Perform the “Acid soak cleaning procedure”.

Level of detergent

Injector in the

detergent

Rinsing the torch

Agilent MP-AES Easy Fit Torch Maintenance 3

Acid soak cleaning procedure

To clean the torch using an acid soak:

1Prepare a 50% Aqua Regia solution (1 part deionized water to 1 part Aqua Regia) in a wide

diameter open beaker. To make Aqua Regia combine 1:3 concentrated nitric acid:

hydrochloric acid.

2Soak the quartz parts of the torch in 50% Aqua Regia for at least 1 hour.

The length of time required for the cleaning procedure will depend upon the extent of the

contamination. Do not leave the torch in the acid for longer than 4 hours. If deposits remain

after using 50% Aqua Regia, repeat the cleaning process using a higher concentration of

Aqua Regia.

3Place the beaker containing the acid solution under the torch cleaning stand.

4Place the torch in the aqua regia through the hole provided in the torch cleaning stand as

shown in Figures 3a. Ensure the quartz outer tube along with the injector is immersed in

the solution as shown in Figures 3b.

Figures 3a and 3b. Soak the torch in the aqua regia solution. Ensure the injector is immersed in the solution

5Pipette some of the acid through the ball joint of the injector to remove build up from the

lower part of the injector. See Figure 4.

Figure 4. Pipette some of the acid solution through the open-end of the ball joint to flush the injector

6Rinse the torch thoroughly and dry completely prior to using the torch in the instrument.

7Follow the steps outlined below for “Rinsing the torch” and “Drying the torch” on Page 4.

Rinsing the torch

To rinse the torch:

1Hold the torch with the ball joint connector at the top.

2Thoroughly flush the inside and outside of the torch with deionized water (18 MΩ.cm) using

a wash bottle to direct the water stream. See Figures 5a, 5b and 5c.

Level o

aqua regia

3a 3b

Injector in the

aqua regia

Drying the torch

4 Agilent MP-AES Easy Fit Torch Maintenance

Figures 5a, 5b and 5c. Rinse the torch with deionized water, flush the injector and gas ports

3Invert the torch (see Figures 6a) so that the quartz tubes are at the top and the ball joint

connector is at the bottom. Flush rinse water through the quartz tubes so that the water

flows out of the gas entry ports and ball joint connector for at least 30 s. See Figures 6b

and 6c.

Figures 6a, 6b and 6c. Flush the gas ports and ball joint connector with deionized water

NOTE For high total dissolved solids (TDS) samples such as soil digests, soak the torch in a 5% v/v

detergent solution for 10 minutes after the initial acid cleaning step. Always rinse the torch

thoroughly and dry completely prior to using the torch in the instrument. Follow the steps

outlined above for “Rinsing the torch” and “Drying the torch” below. This extra step can help to

reduce deposition on the outer tube of the torch.

Drying the torch

CAUTION Do not place the torch in a drying oven. It is not as effective at removing moisture as using

compressed air or nitrogen, and may damage the torch.

To dry the torch:

1Hold the torch inverted (with the ball joint connector at the top).

2Blow clean compressed air or nitrogen through the gas ports on the base and through the

opening of the ball joint to remove moisture. See Figure 7a and 7b.

5a 5b 5c

6a 6b

Additional checks after cleaning

Agilent MP-AES Easy Fit Torch Maintenance 5

Figure 7a and 7b. Use compressed air or nitrogen to dry the torch

3Ensure that all moisture is removed before refitting the torch into the instrument.

Additional checks after cleaning

Perform the following checks after cleaning:

1Inspect the torch for damage such as loose fitting of the quartz tubes in the plastic base,

holes or significant cracks. If any damage is found, replace the torch immediately.

2Check for carry-over after refitting the torch to determine if the cleaning procedure has

been sufficient. If carry-over is found, repeat the cleaning process.

3Replace the torch when the outer surface of the quartz outer tube is rough to the touch

(which indicates signs of wear), or if there are any cracks visible.

NOTE

Long term exposure to acid during cleaning may lead to discoloration of the plastic base. This

change is cosmetic only and should not impact performance if the torch is clean and the results

of the other torch checks are satisfactory.

Store the torch in the original box or a plastic bag when not in use.

7a 7b

In This Document

This document describes maintenance and cleaning

procedures required to maximize your Agilent MP-AES

Easy Fit Torch lifetime.

www.agilent.com

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Mulgrave, VIC 3170, Australia

Edition 5, 6/18

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