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定氮儀能夠快速測定樣品的氮含量

更新時間:2023-02-24      點擊次數:344
   該儀器(qi)(qi)采用(yong)(yong)凱氏定氮(dan)(dan)(dan)法檢測(ce)物(wu)品(pin)(pin)氮(dan)(dan)(dan)含(han)量(liang)(liang)以及(ji)蛋白質含(han)量(liang)(liang)計算的(de)專用(yong)(yong)儀器(qi)(qi),能夠(gou)(gou)對糧食、食品(pin)(pin)、飼料、土壤、乳制(zhi)品(pin)(pin)、飲料等多種物(wu)品(pin)(pin)進行檢測(ce),過程全自(zi)動控(kong)制(zhi),可實現(xian)一鍵式自(zi)動添加實際、自(zi)動蒸餾分(fen)離樣品(pin)(pin)、自(zi)動終止蒸餾等。定氮(dan)(dan)(dan)儀的(de)使用(yong)(yong),能夠(gou)(gou)快速(su)測(ce)定樣品(pin)(pin)的(de)氮(dan)(dan)(dan)含(han)量(liang)(liang),配以相應的(de)措(cuo)施可以有效控(kong)制(zhi)氮(dan)(dan)(dan)含(han)量(liang)(liang):測(ce)定土壤中的(de)氮(dan)(dan)(dan)含(han)量(liang)(liang),可以直接其是(shi)否(fou)缺少氮(dan)(dan)(dan)含(han)量(liang)(liang),是(shi)否(fou)超標。氮(dan)(dan)(dan)含(han)量(liang)(liang)缺少,我(wo)們(men)可以使用(yong)(yong)氮(dan)(dan)(dan)肥提(ti)高土壤氮(dan)(dan)(dan)含(han)量(liang)(liang),反(fan)之我(wo)們(men)可以減少氮(dan)(dan)(dan)肥的(de)使用(yong)(yong)。
  從定(ding)(ding)(ding)氮(dan)(dan)(dan)原理可(ke)以(yi)知(zhi)道:凱(kai)氏定(ding)(ding)(ding)氮(dan)(dan)(dan)法是(shi)(shi)(shi)將含(han)氮(dan)(dan)(dan)有機(ji)物轉變為(wei)無機(ji)氮(dan)(dan)(dan)硫酸銨來進行檢測(ce)(ce)(ce)(ce),以(yi)得(de)到(dao)含(han)氮(dan)(dan)(dan)量(liang)的(de)(de)(de)測(ce)(ce)(ce)(ce)定(ding)(ding)(ding)值乘(cheng)(cheng)以(yi)一定(ding)(ding)(ding)系數(shu)得(de)出(chu)蛋白(bai)(bai)質(zhi)(zhi)(zhi)含(han)量(liang)。而含(han)氮(dan)(dan)(dan)有機(ji)物不僅僅是(shi)(shi)(shi)蛋白(bai)(bai)質(zhi)(zhi)(zhi),還有三(san)聚(ju)氰(qing)胺等等。在加(jia)上食品中(zhong)(zhong)蛋白(bai)(bai)質(zhi)(zhi)(zhi)含(han)量(liang)的(de)(de)(de)現行國家標準(zhun)和(he)國際通行測(ce)(ce)(ce)(ce)定(ding)(ding)(ding)方法是(shi)(shi)(shi)經典凱(kai)氏定(ding)(ding)(ding)氮(dan)(dan)(dan)法,這就為(wei)造假者提供了可(ke)乘(cheng)(cheng)之(zhi)機(ji)。蛋白(bai)(bai)質(zhi)(zhi)(zhi)中(zhong)(zhong)的(de)(de)(de)含(han)氮(dan)(dan)(dan)量(liang)不超過(guo)30%,三(san)聚(ju)氰(qing)胺的(de)(de)(de)最大(da)的(de)(de)(de)特點是(shi)(shi)(shi)含(han)氮(dan)(dan)(dan)量(liang)很(hen)高(gao)(66%),溶于(yu)水后無色無味,也就是(shi)(shi)(shi)說在一杯清水中(zhong)(zhong)加(jia)入三(san)聚(ju)氰(qing)胺,然后用凱(kai)氏定(ding)(ding)(ding)氮(dan)(dan)(dan)法檢測(ce)(ce)(ce)(ce),結果顯示是(shi)(shi)(shi)含(han)有蛋白(bai)(bai)質(zhi)(zhi)(zhi)的(de)(de)(de)。由于(yu)“凱(kai)氏定(ding)(ding)(ding)氮(dan)(dan)(dan)法”只能測(ce)(ce)(ce)(ce)出(chu)含(han)氮(dan)(dan)(dan)量(liang),并不能鑒定(ding)(ding)(ding)飼料中(zhong)(zhong)有無違規化學物質(zhi)(zhi)(zhi),所以(yi),添加(jia)三(san)聚(ju)氰(qing)胺的(de)(de)(de)奶粉理論上可(ke)以(yi)測(ce)(ce)(ce)(ce)出(chu)較高(gao)的(de)(de)(de)蛋白(bai)(bai)質(zhi)(zhi)(zhi)含(han)量(liang)。
  定氮(dan)(dan)儀的(de)(de)(de)使(shi)用(yong),能(neng)夠(gou)快速(su)測(ce)定樣(yang)品的(de)(de)(de)氮(dan)(dan)含(han)(han)量,配以(yi)(yi)相應的(de)(de)(de)措施可(ke)(ke)以(yi)(yi)有效控制氮(dan)(dan)含(han)(han)量:測(ce)定土(tu)壤中(zhong)的(de)(de)(de)氮(dan)(dan)含(han)(han)量,可(ke)(ke)以(yi)(yi)了解其是否缺少(shao)(shao)氮(dan)(dan)含(han)(han)量,是否超標。氮(dan)(dan)含(han)(han)量缺少(shao)(shao),我(wo)(wo)(wo)們(men)(men)(men)可(ke)(ke)以(yi)(yi)使(shi)用(yong)氮(dan)(dan)肥提高土(tu)壤氮(dan)(dan)含(han)(han)量,反之(zhi)我(wo)(wo)(wo)們(men)(men)(men)可(ke)(ke)以(yi)(yi)減(jian)少(shao)(shao)氮(dan)(dan)肥的(de)(de)(de)使(shi)用(yong)。這樣(yang)能(neng)夠(gou)提高氮(dan)(dan)肥的(de)(de)(de)利(li)用(yong)率,減(jian)少(shao)(shao)氮(dan)(dan)肥對環境的(de)(de)(de)污染。減(jian)少(shao)(shao)氮(dan)(dan)肥的(de)(de)(de)開支。我(wo)(wo)(wo)們(men)(men)(men)可(ke)(ke)以(yi)(yi)測(ce)定食品中(zhong)的(de)(de)(de)氮(dan)(dan)含(han)(han)量,防止氮(dan)(dan)含(han)(han)量超標的(de)(de)(de)反作用(yong)。可(ke)(ke)以(yi)(yi)用(yong)于監(jian)測(ce)食品安全,防止不(bu)良食品流入市場。總之(zhi)該儀器用(yong)處多(duo)多(duo),我(wo)(wo)(wo)們(men)(men)(men)可(ke)(ke)以(yi)(yi)廣泛使(shi)用(yong)。