A suitable and green analytical method using microwave-induced combustion and ion chromatography with conductivity detection (IC-CD) and mass spectrometry detection (IC-MS) was proposed for the halogens and sulfur determination in pet food using a single analysis. Samples (up to 500 mg) were efficiently digested in a closed system under oxygen pressure (20 bar). Ultrapure water and 50 mmol L⁻¹ or 100 mmol L⁻¹ (NH₄)₂CO₃ were evaluated as absorbing solutions. Trueness was evaluated by recovery tests using standard solution and certified reference materials. In both tests, mean recoveries ranging from 91 to 108% for all analytes were obtained using 50 mmol L⁻¹ (NH₄)₂CO₃ as absorbing solution. AOAC International recommended official methods for Cl and F determination in animal feed were also performed. Results for Cl using proposed method were in agreement with those obtained using AOAC official method, while the results for F were not compared between them because the concentration in the samples using AOAC official method was not detected. Precision was evaluated in terms of repeatability and the relative standard deviations (RSDs) using the proposed method were always lower than 8%. The proposed method presents several advantages when compared with AOAC International official methods such as the multielemental determination capability, lower waste generation, lower limits of detection, lower RSDs, and higher sample throughput. Sixteen samples destined to cats or dogs from different manufacturers were analyzed and the results showed a wide variation. These results indicate that an efficient quality control should be performed, and the proposed method is an excellent alternative as a new analytical tool for routine analysis of pet food.

中文翻译：

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宠物食品中卤素和硫的多元素分析的绿色分析方法

提出了一种适用于绿色环保的分析方法，该方法采用微波诱导燃烧和离子色谱法，并通过电导检测（IC-CD）和质谱检测（IC-MS）进行一次分析，用于宠物食品中的卤素和硫的测定。在密闭系统中，在氧气压力（20 bar）下有效地消化了样品（最多500 mg）。评价超纯水和50mmol L ^-1或100mmol L ^-1（NH ₄）₂ CO ₃作为吸收溶液。使用标准溶液和经过认证的参考材料通过回收率测试评估真实性。在这两个测试中，使用50 mmol L ^-1（NH ₄）₂一氧化碳₃作为吸收溶液。AOAC International还推荐了确定动物饲料中Cl和F的官方方法。采用建议的方法测定Cl的结果与使用AOAC官方方法获得的结果一致，但未比较F的结果，因为未检测到使用AOAC官方方法测定的样品中的浓度。根据重复性评估精度，使用所提出的方法的相对标准偏差（RSD）始终低于8％。与AOAC International官方方法相比，该方法具有多种优势，例如多元素测定能力，废物产生量少，检测限低，RSD较低和样品通量较高。分析了16个发往不同制造商的猫或狗的样品，结果显示差异很大。这些结果表明，应该执行有效的质量控制，并且所提出的方法是作为常规分析宠物食品的新分析工具的绝佳替代方法。