SPSFAM Heavy Metals ERP - Arsenic

In the Matrix Specific Repeatability, Reproducibility and Recovery Studies table for Grape Juice, the values listed for arsenite are LOQ should have been used for the SLV. There were no example chromatograms. An analyst not familiar with the method should know what order the peaks elute and what an example chromatogram should look like. There was no accuracy data for arsenite and arsenate but rather only for total inorganic arsenic. Therefore arseneite and arsenate should be removed from the applicability statement. There was no data for juice concentrate in the Matrix Specific Repeatability, Reproducibility and Recovery Studies section. Therefore juice concentrate should be removed from the applicability statement.

There was only one reference material to judge accuracy. Two or more CRMs would have been better.

There was no information on how the Reproducibility and Recovery Study data was obtained such as how many analysts and instruments were involved, over how many days were the data collected and were the days consecutive.

There was no ruggedness data.

Method Optimization: No data

Performance Characteristics

Analytical Range:

Juice - 0.5 ppb to 0.5 ppm Fails SMPR upper range of 1 ppm

Juice concentrate - 2 ppb to 2 ppm

Rice and rice Products - 6.7 ppb to 6.7 ppm LOQ: Difficult to tell what is the LOQ. Table 2015.01H lists values but the values are the same for juice and rice even though these sample types have different prep dilutions. Accuracy/Recovery: Accuracy based on SRM 1568b was excellent for TIAs (99%), MMAs (99%) and DMAs (100%). Note that there was no data for arsenite and arsenate individually. Precision (RSD r ): Generally in the 1% to 5% range for the 4 matrix types. Exceptions outside of SMPR requirements were baby cereal and rice for arsenate (both at 25%).