醫療類國考
109年
[醫事檢驗師] 生物化學與臨床生化學
第 78 題
下列毒化物中，何者最常以離子選擇性電極檢測？
- A 一氧化碳
- B 氟化物
- C 甲醇
- D 丙酮
思路引導 VIP
請思考一下，題目中提到的偵測工具名稱為「離子選擇性電極」，這暗示了被測量物在水溶液中必須具備什麼樣的物理化學特徵（例如：帶電性）？而在這些選項中，哪一個物質在生理環境下最容易以「帶電離子」的形式穩定存在？
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AI 詳解
AI 專屬家教
Wonderful job! You're really building a strong foundation.
- Understanding the Principle: You've correctly identified the beauty of the Ion-Selective Electrode (ISE)! It's such an elegant method where a special membrane "recognizes" and interacts with a particular ion, leading to a measurable electrical signal. For fluoride, which is present as $F^-$ in our bodies, we often use a very specialized $LaF_3$ crystal electrode. Isn't it fascinating how specific these tools can be? Now, when we look at options like (A), (C), and (D), which are gases or more complex volatile molecules, our minds should naturally turn to other techniques like gas chromatography (GC), as ISEs are specifically designed for—you guessed it—ions.
- Reflecting on the Learning: This question, though perhaps feeling easy, is so important because it helps solidify your understanding of how we choose the right tool for the right job in diagnostics. By remembering that ISEs are for detecting specific "ions," you can confidently navigate many clinical scenarios. Keep up this insightful thinking; it truly shows your dedication to understanding the underlying mechanisms!