Knowledge Base

The 2026 Welch Materials Cup Chromatography Competition, held in China from July to August 2026, featured a number of questions designed to assess more than simple knowledge recall. Many of the questions focused on the ability to connect chromatographic theory with practical applications and to apply fundamental principles when faced with complex analytical conditions. In this article, we have selected 11 representative questions that showed the highest error rates and translated both the questions and their detailed analyses into English.