Hach Company

Douglas Ford Royer

Andreas Golitz

Charles C Johnson

Bas De Heij

An embodiment provides a method for measuring arsenic in a sample, showing marked increase in sensitivity over previous methods including: preparing a compound of metal-plated zinc and zinc; introducing the compound to an acidified sample, wherein the sample contains an amount of arsenic, wherein the compound reduces the amount of arsenic to produce arsine gas; wherein sufficient hydrogen gas is produced to purge the sample solution; wherein the arsine gas is completely purged from the sample and captured on a test pad, wherein the pad comprises mercuric bromide, wherein the capturing produces a color change of the pad; and measuring the amount of arsenic in the sample by measuring the color change of the pad. Other aspects are described and claimed.

Reducing agent for arsenic measurement

An embodiment provides a turbidimeter standard ampule, including: a main part composed of glass and containing therein a formazin solution comprising a formazine polymer diluted in a solvent; the main part including a lens positioned in a bottom edge thereof and permitting entry of light from a turbidimeter; the main part having glass sides and permitting redirected light to exit the glass sides for detection by a photodetector of the turbidimeter; an upper part composed of glass and being attached to the main part; and an opaque cap on the upper part, the opaque cap blocking light from entering the upper part of the ampule. Other embodiments are described and claimed.

Vial and cap for turbidity standard

A chemical indicating device () for detection of chloride ions in a sample is provided. The chemical indicating device () includes a carrier matrix () and an indicator () having silver and vanadate supported on the carrier matrix ().

Chromium-free indicating device

A chemical indicating device () for detection of chloride ions in a sample is provided. The chemical indicating device () includes a carrier matrix () and an indicator () having silver and vanadate supported on the carrier matrix (). A method for detecting chloride ions is also provided.

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Gilbert, IA, United States of America

Douglas Ford Royer