碘離子和汞離子在強堿性條件下,會與氨反應生成淡紅棕色絡合物 ,此顏色在波長420nm處會有強烈的吸收。而生成的這類紅棕色絡合物的吸光度 會與其溶液的氨氮含量 成正比,可用測試反應液的吸收值 而測定氨氮 的含量。<span background-color:#f5f5f5;"="">安全術語S13：Keep away from food, drink and animal feeding stuffs.遠離食品、飲料和動物飼料保存。S26：In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.眼睛接觸后，立即用大量水沖洗并征求醫生意見。S28：After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer).皮膚接觸后，立即用大量...（由生產廠家）沖洗。S36/37/39：Wear suitable protective clothing, gloves and eye/face protection.穿戴適當的防護服、手套和眼睛/面保護。
