Lamotte SMART3 Colorimeter User Manual download pdf (Page 12)

Sampler (LaMotte Code 1060) will serve as a subsurface or in-depth sampler.

This weighted device is lowered to the sampling depth and allowed to rest at

this depth for a few minutes. The water percolates into the sample chamber

displacing the air which bubbles to the surface. When the bubbles cease to rise,

the device has ﬂ ushed itself approximately ﬁ ve times and it may be raised to

the surface for examination. The inner chamber of the sampling device is lifted

out and portions of the water sample are carefully dispensed for subsequent

chemical analysis.

A Snap-Plunger Water Sampler (LaMotte Code 1077) is another “in-depth”

sampling device which is designed to collect large samples which can be used

for a multitude of tests. Basically, this collection apparatus is a hollow cylinder

with a spring loaded plunger attached to each end. The device is cocked

above the surface of the water and lowered to the desired depth. A weighted

messenger is sent down the calibrated line to trip the closing mechanism

and the plungers seal the sample from mixing with intermediate layers as it is

brought to the surface. A special drain outlet is provided to draw off samples for

chemical analysis.

Sampling of Closed System

To obtain representative samples from conﬁ ned water systems, such as

pipe lines, tanks, vats, ﬁ lters, water softeners, evaporators and condensers,

different considerations are required because of chemical changes which occur

between the inlet and outlet water. One must have a basic understanding of the

type of chemical changes which occur for the type of equipment used. Also,

consideration should be given to the rate of passage and retaining time for the

process water.

Temperature changes play an important part in deciding exactly what test

should be performed. Process water should be allowed to come to room

temperature, 20–25°C, before conducting any tests.

When drawing off samples from an outlet pipe such as a tap, allow sample to

run for several minutes, rinsing the container several times before taking the ﬁ nal

sample. Avoid splashing and introduction of any contaminating material.

 FILTRATION

When testing natural waters that contain signiﬁ cant turbidity due to suspended

solids and algae, ﬁ ltration is an option. Reagent systems, whether EPA,

Standard Methods, LaMotte or any others, will generally only determine

dissolved constituents. Both EPA and Standard Methods suggest ﬁ ltration

through a 0.45 micron ﬁ lter membrane, to remove turbidity, for the determination

of dissolved constituents.** To test for total constituents, organically bound and

suspended or colloidal materials, a rigorous high temperature acid digestion is

necessary.

**LaMotte offers a ﬁ ltering apparatus: syringe assembly (Code 1050) and

membrane ﬁ lters, 0.45 micron, (Code 1103).

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Lamotte SMART3 Colorimeter User Manual Page 12

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