碘离子和汞离子在强碱性条件下,会与氨反应生成淡红棕色络合物 ,此颜色在波长420nm处会有强烈的吸收。而生成的这类红棕色络合物的吸光度 会与其溶液的氨氮含量 成正比,可用测试反应液的吸收值 而测定氨氮 的含量。<span background-color:#f5f5f5;"="">安全术语S13：Keep away from food, drink and animal feeding stuffs.远离食品、饮料和动物饲料保存。S26：In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.眼睛接触后，立即用大量水冲洗并征求医生意见。S28：After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer).皮肤接触后，立即用大量...（由生产厂家）冲洗。S36/37/39：Wear suitable protective clothing, gloves and eye/face protection.穿戴适当的防护服、手套和眼睛/面保护。
