Acrylics, determination Arsenic

These hydrides can be determined by AAS. To illustrate, let us consider a method developed for the determination of trace amounts of arsenic in acrylic fibres containing antimony oxide fire-retardant additive [34]. The arsenic occurs as an impurity in the antimony oxide additive and, as such, its concentration must be controlled at a low level. 

The results for the arsenic obtained with various acrylic fibre samples containing antimony oxide are given in Table 11.7. Antimony, present as the trioxide, has been accurately determined in a concentrated hydrochloric acid extract of PP powder [35]. 

Table 11.7 Results for the determination of arsenic in acrylic fibres containing antimony oxide ...

Even when antimony (III) was present in acrylic fibres (samples 6, 9 and 10), antimony (111) was easily and completely oxidised to antimony (V) by the wet digestion with a mixture of nitric, perchloric and sulfuric acids. Hence, arsenic in acrylic fibres containing antimony (III) oxide could be determined as well as that in acrylic fibre samples containing antimony(V) oxide by this method. Reproduced with permission from T. Korenaga, Royal Society of Chemistry [34] ... 

Method 1.2. Determination of Traces of Arsenic in Acrylic Fibres Containing Antimony Trioxide Fire Retardant Agent. Acid Digestion, Atomic Absorption Spectrometry... 

This atomic absorption spectrometric method determines down to 0.02% arsenic trioxide fire retardant in acrylic fibres. 

This method is capable of determining down to 0.02% arsenic in acrylic fibres with an accuracy of 5%. Antimony present in the sample does not interfere. 

METHOD 73 - DETERMINATION OF TRACES OF ARSENIC IN ACRYLIC FIBRES CONTAINING ANTIMONY TRIOXIDE FIRE RETARDENT AGENT. ACID DIGESTION ATOMIC ABSORPTION SPECTROMETRY. ... 

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