The crystal structure and the electrochemical behavior of a Ru-complex, which was obtained from a reaction of [Ru2(MeCOO)4Cl] with 2-pyridinecarboxylic acid and NO2−, were investigated: the complex consists of nitrosyl, 2-pyridinecarboxylato, and acetato ligands. The cyclic voltammogram showed no redox wave in the region of the potential window, unlike common Ru(NO)-complexes.
We have developed the liquid chromatography-ultraviolet adsorption detector (LC/UV) , mass spectrometry (LC/ MS) , and tandem mass spectrometry (LC/MS/MS) analysis methods for the simultaneous determination of formaldehyde and acetaldehyde in drinking water. Furthermore, 15 organizations have conducted a validation test to confirm the validity of the analytical methods. Recovery tests of these chemicals spiked into drinking water samples distributed to each organization were performed for two set points; the standard value and 1/10 of the standard value for formaldehyde in the Japanese Waterworks Act. The linearity of the calibration curves, selectivity, accuracy (recovery) , repeatability, and intermediate precision for each chemical were calculated using the data of the recovery tests. The linearity of the calibration curves and selectivity were satisfactory for both chemicals. The accuracy, repeatability, and intermediate precision for both chemicals obtained by the recovery tests satisfied the criteria in the guideline for the validation of testing methods for drinking water, which has been specified by the Ministry of Health, Labour and Welfare, Japan. Therefore, we concluded that the analytical method developed in the present study is valid for the analysis of formaldehyde and acetaldehyde in drinking water.
We developed a liquid chromatography-tandem mass spectrometry (LC/MS/MS) analysis method for the simultaneous determination of 141 agricultural chemicals, the "Complimentary Items" in tap water in the Japanese Waterworks Act. Furthermore, we evaluated the validity of the analytical method on the basis of the results of the recovery tests performed with two set points, that is 1/10 of the desired value and 1/100 of the desired value of each agricultural chemical in the Japanese Waterworks Act. For 129 agricultural chemicals (when dechlorinated with sodium ascorbate) or 127 agricultural chemicals (when dechlorinated with sodium thiosulfate) , the quantification limits were lower than 1/10 of the desired values of each chemical, and the accuracy (recovery ratio) and repeatability also satisfied the criteria. For 120 agricultural chemicals, the quantification limits were lower than 1/100 of the desired values of each chemical, and the accuracy (recovery ratio) and repeatability satisfied the criteria of the Japanese guideline concerning water quality analysis. Therefore, we judged that our simultaneous analytical method developed in the present study is applicable to the analysis of 120 agricultural chemicals in drinking water. However, we should select the dichlorination treatment agent in accordance with the target chemicals.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.