Simultaneous Determination of Pyridine-Triphenylborane Anti-Fouling Agent and Its Degradation Products in Artificial Seawater by CZE

Abstract

We developed a CZE method for simultaneous determination of pyridinetriphenylborane (PTPB) anti-fouling agent and its degradation products such as diphenylborinic acid (DPB), phenylboronic acid (MPB), and phenol in artificial seawater (ASW) with no extraction procedure. The ASW samples, in which 20% (v/v) acetonitrile (ACN) was added, were injected directly into the capillary using vacuum injection. As the background electrolyte (BGE), 60 mM sodium tetraborate adjusted to pH 9.8 was used. The LODs (S/N = 3) for PTPB, DPB, MPB, and phenol were, respectively, 55, 78, 126, and 30 g L-1. The RSDs (n = 4) for analytes listed above were in the respective ranges of 2.7-5.7, 0.68-6.1, and 0.69-1.1% for peak area, peak height, and migration time. Simple degradation experiments were conducted to verify the usefulness of the proposed method. The PTPB samples dissolved in ASW were put in the open air and rooms with and without light. The sample solutions were analyzed over time. We inferred that PTPB in ASW was more degraded by photolysis than by hydrolysis. The proposed CZE method has been demonstrated as a useful tool to elucidate the PTPB degradation process and its degradation products in ASW.

CZE determination of submicromolar level of phenol in seawater using improved dynamic pH junction

“…The LOD for phenol was 5.9 g/L at S/N of 3 (S is the peak height and N is the magnitude of the noise). The value was 5.1 and 3.2 times lower than those for the previous CZE method for seawater samples (30 g/L) [25] and for the CZE chemiluminescence detection for reused water (19 g/L) [21], respectively. The LOQ (S/N = 10) of the proposed method (20 g/L) was 2.4 times lower than that for the CZE amperometric detection (47 g/L) [22].…”

“…developed a CZE method with dynamic pH junction to quantify nitrophenols in tap water and fishpond water . Nevertheless, no report of the literature, except for our study, describes the detection and quantification of phenol in seawater .…”