{"id":3888,"date":"2025-09-04T10:08:05","date_gmt":"2025-09-04T02:08:05","guid":{"rendered":"https:\/\/www.pgeneral.com\/?p=3888"},"modified":"2025-09-04T10:08:05","modified_gmt":"2025-09-04T02:08:05","slug":"determination-of-potassium-in-sweet-potato-products-flame-atomic-absorption-spectrometry","status":"publish","type":"post","link":"https:\/\/www.pgeneral.com\/vi\/applications\/determination-of-potassium-in-sweet-potato-products-flame-atomic-absorption-spectrometry","title":{"rendered":"X\u00e1c \u0111\u1ecbnh Kali trong c\u00e1c s\u1ea3n ph\u1ea9m khoai t\u00e2y ng\u1ecdt (Ph\u1ed5 \u0111o h\u1ea5p th\u1ee5 nguy\u00ean t\u1eed l\u1eeda)"},"content":{"rendered":"

1. T\u1ed5ng quan v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p<\/h2>\n
Sau khi m\u1eabu \u0111\u01b0\u1ee3c ti\u00eau h\u00f3a, n\u00f3 \u0111\u01b0\u1ee3c nguy\u00ean t\u1eed h\u00f3a b\u1edfi ng\u1ecdn l\u1eeda c\u1ee7a m\u1ed9t quang ph\u1ed5 h\u1ea5p th\u1ee5 nguy\u00ean t\u1eed, v\u00e0 \u0111\u1ed9 h\u1ea5p th\u1ee5 \u0111\u01b0\u1ee3c \u0111o \u1edf b\u01b0\u1edbc s\u00f3ng 766,5 nm. Trong m\u1ed9t ph\u1ea1m vi n\u1ed3ng \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh, gi\u00e1 tr\u1ecb h\u1ea5p th\u1ee5 t\u1ef7 l\u1ec7 v\u1edbi h\u00e0m l\u01b0\u1ee3ng kali v\u00e0 \u0111\u1ecbnh l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng c\u00e1ch so s\u00e1nh v\u1edbi m\u1ed9t lo\u1ea1t ti\u00eau chu\u1ea9n.<\/div>\n
\n

2. D\u1ee5ng c\u1ee5 v\u00e0 thu\u1ed1c th\u1eed<\/h2>\n

2.1 D\u1ee5ng c\u1ee5 v\u00e0 thi\u1ebft b\u1ecb<\/h3>\n

2.1.1 D\u1ee5ng c\u1ee5 ki\u1ec3m tra<\/h4>\n
\n
\n\n\n\n\n\n\n\n
S\u1ed1 Serial<\/th>\nT\u00ean<\/th>\nS\u1ed1 l\u01b0\u1ee3ng<\/th>\nY\u00eau c\u1ea7u k\u1ef9 thu\u1eadt<\/th>\nPh\u1ee5 ki\u1ec7n<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nM\u00e1y quang ph\u1ed5 h\u1ea5p th\u1ee5 nguy\u00ean t\u1eed ng\u1ecdn l\u1eeda<\/td>\n1 b\u1ed9<\/td>\n–<\/td>\n\u0110\u00e8n cathode r\u1ed7ng kali<\/td>\n<\/tr>\n
2<\/td>\nM\u00e1y n\u00e9n kh\u00ed<\/td>\n1 b\u1ed9<\/td>\n\u00c1p su\u1ea5t x\u1ea3 \u0111\u1ecbnh m\u1ee9c: 0,3 MPa<\/td>\n–<\/td>\n<\/tr>\n
3<\/td>\nKh\u00ed Acetylene<\/td>\n1 xi lanh<\/td>\n\u0110\u1ed9 tinh khi\u1ebft \u2265 99,99%<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.1.2 Thi\u1ebft b\u1ecb x\u1eed l\u00fd tr\u01b0\u1edbc m\u1eabu<\/h4>\n
\n
\n\n\n\n\n\n\n\n\n\n\n
S\u1ed1 Serial<\/th>\nT\u00ean<\/th>\nS\u1ed1 l\u01b0\u1ee3ng<\/th>\nY\u00eau c\u1ea7u k\u1ef9 thu\u1eadt<\/th>\nPh\u1ee5 ki\u1ec7n<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nMicropipette<\/td>\n1 m\u1ed7i<\/td>\nPh\u1ea1m vi: 100 \u03bcL ~ 1000 \u03bcL, 1000 \u03bcL ~ 5000 \u03bcL, 5 ~ 50 \u03bcL<\/td>\n–<\/td>\n<\/tr>\n
2<\/td>\n\u1ed1ng \u0111o m\u00e0u<\/td>\nM\u1ed9t s\u1ed1<\/td>\nKh\u1ed1i l\u01b0\u1ee3ng: 10 ml, 25 ml<\/td>\n–<\/td>\n<\/tr>\n
3<\/td>\nT\u1ea5m n\u00f3ng c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh<\/td>\n1 b\u1ed9<\/td>\nNhi\u1ec7t \u0111\u1ed9 \u0111\u1ecbnh m\u1ee9c: Nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng ~ 300 \u2103<\/td>\n–<\/td>\n<\/tr>\n
4<\/td>\nKh\u1ed1i l\u01b0\u1ee3ng Flask<\/td>\nM\u1ed9t s\u1ed1<\/td>\nKh\u1ed1i l\u01b0\u1ee3ng: 100 ml, 1000 ml<\/td>\n–<\/td>\n<\/tr>\n
5<\/td>\nS\u1ef1 c\u00e2n b\u1eb1ng ph\u00e2n t\u00edch<\/td>\n1 b\u1ed9<\/td>\n\u0110\u1ed9 nh\u1ea1y c\u1ea3m: 0,1 mg<\/td>\n–<\/td>\n<\/tr>\n
6<\/td>\nTh\u00f9ng Erlenmeyer<\/td>\nM\u1ed9t s\u1ed1<\/td>\nKh\u1ed1i l\u01b0\u1ee3ng: 150 ml<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

2.2 Ph\u1ea3n \u1ee9ng<\/h3>\n

2.2.1 Ph\u1ea3n \u1ee9ng th\u00f4<\/h4>\n
\n
\n\n\n\n\n\n
S\u1ed1 Serial<\/th>\nT\u00ean<\/th>\nY\u00eau c\u1ea7u k\u1ef9 thu\u1eadt<\/th>\nNh\u1eadn x\u00e9t<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\naxit nitric<\/td>\nL\u1edbp MOS<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.2 Ph\u1ea3n \u1ee9ng chu\u1ea9n b\u1ecb<\/h4>\n
\n
\n\n\n\n\n\n
S\u1ed1 Serial<\/th>\nT\u00ean<\/th>\nPh\u01b0\u01a1ng ph\u00e1p chu\u1ea9n b\u1ecb<\/th>\nNh\u1eadn x\u00e9t<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nGi\u1ea3i ph\u00e1p axit nitric (5 95)<\/td>\n\u0110o 50 ml axit nitric v\u00e0 tr\u1ed9n \u0111\u1ed3ng \u0111\u1ec1u v\u1edbi 950 ml n\u01b0\u1edbc.<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.3 Ti\u00eau chu\u1ea9n tham kh\u1ea3o<\/h3>\n

2.3.1 Gi\u1ea3i ph\u00e1p ch\u1ee9ng kho\u00e1n<\/h4>\n
\n
\n\n\n\n\n\n
S\u1ed1 Serial<\/th>\nKh\u00f4ng.<\/th>\nT\u00ean<\/th>\nY\u00eau c\u1ea7u k\u1ef9 thu\u1eadt<\/th>\nNh\u1eadn x\u00e9t<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nGBW (E) 080125<\/td>\nGi\u1ea3i ph\u00e1p ti\u00eau chu\u1ea9n nguy\u00ean t\u1ed1 \u0111\u01a1n kali<\/td>\nN\u1ed3ng \u0111\u1ed9: 1000 \u03bcg \/ ml<\/td>\nVi\u1ec7n \u0111o l\u01b0\u1eddng qu\u1ed1c gia, Trung Qu\u1ed1c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

3. Quy tr\u00ecnh v\u1eadn h\u00e0nh<\/h2>\n

3.1 Chu\u1ea9n b\u1ecb m\u1eabu<\/h3>\n

3.1.1 Chu\u1ea9n b\u1ecb gi\u1ea3i ph\u00e1p th\u1eed nghi\u1ec7m<\/h4>\n
Tr\u1ecdng l\u01b0\u1ee3ng ch\u00ednh x\u00e1c 1 ~ 2 g m\u1eabu (ch\u00ednh x\u00e1c \u0111\u1ebfn 0,001 g) v\u00e0o m\u1ed9t b\u00ecnh Erlenmeyer, th\u00eam 10 mL axit nitric v\u00e0 ti\u00eau h\u00f3a tr\u00ean t\u1ea5m n\u00f3ng (\u0111i\u1ec1u ki\u1ec7n tham chi\u1ebfu: 80 \u2103 \/ 1 gi\u1edd, 120 \u2103 \/ 1 gi\u1edd, 140 \u2103 \/ 2 gi\u1edd, 160 \u2103 \/ 2 gi\u1edd, sau \u0111\u00f3 t\u0103ng nhi\u1ec7t \u0111\u1ed9 l\u00ean 180 \u2103). N\u1ebfu dung d\u1ecbch bi\u1ebfn th\u00e0nh m\u00e0u n\u00e2u, th\u00eam axit nitric v\u00e0 ti\u1ebfp t\u1ee5c ti\u00eau h\u00f3a cho \u0111\u1ebfn khi kh\u00f3i tr\u1eafng \u0111\u01b0\u1ee3c ph\u00e1t ra. Khi dung d\u1ecbch tr\u1edf n\u00ean kh\u00f4ng m\u00e0u v\u00e0 trong su\u1ed1t ho\u1eb7c h\u01a1i v\u00e0ng, l\u00e0m m\u00e1t n\u00f3 v\u00e0 pha lo\u00e3ng \u0111\u1ebfn d\u1ea5u hi\u1ec7u trong m\u1ed9t \u1ed1ng \u0111o m\u00e0u 10 ml v\u1edbi n\u01b0\u1edbc. Chu\u1ea9n b\u1ecb m\u1ed9t thu\u1ed1c th\u1eed tr\u1ed1ng c\u00f9ng m\u1ed9t l\u00fac.<\/div>\n

3.1.2 Chu\u1ea9n b\u1ecb c\u00e1c gi\u1ea3i ph\u00e1p ti\u00eau chu\u1ea9n<\/h4>\n
    \n
  1. \n
    Chu\u1ea9n b\u1ecb gi\u1ea3i ph\u00e1p trung gian ti\u00eau chu\u1ea9n kali (10 \u03bcg \/ mL):
    B\u01a1m ch\u00ednh x\u00e1c 1 mL dung d\u1ecbch ti\u00eau chu\u1ea9n qu\u1ed1c gia kali v\u00e0o m\u1ed9t b\u00ecnh kh\u1ed1i l\u01b0\u1ee3ng 100 mL, th\u00eam dung d\u1ecbch axit nitric (5 99) v\u00e0o d\u1ea5u hi\u1ec7u v\u00e0 thu \u0111\u01b0\u1ee3c dung d\u1ecbch trung gian ti\u00eau chu\u1ea9n (10 \u03bcg \/ mL).<\/div>\n<\/li>\n
  2. \n
    Chu\u1ea9n b\u1ecb Kalium Standard Series:
    Pipet ch\u00ednh x\u00e1c 0,0, 1,0, 2,0, 3,0 v\u00e0 4,0 mL dung d\u1ecbch trung gian ti\u00eau chu\u1ea9n kali (10 \u03bcg \/ mL) v\u00e0o c\u00e1c b\u00ecnh kh\u1ed1i l\u01b0\u1ee3ng 100 mL ri\u00eang bi\u1ec7t t\u01b0\u01a1ng \u1ee9ng. Th\u00eam dung d\u1ecbch axit nitric (5 95) v\u00e0o nh\u00e3n hi\u1ec7u \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c lo\u1ea1t ti\u00eau chu\u1ea9n kali v\u1edbi n\u1ed3ng \u0111\u1ed9 0,0, 0,1, 0,2, 0,3 v\u00e0 0,4 \u03bcg \/ mL.<\/div>\n<\/li>\n<\/ol>\n

    3.2 Ki\u1ec3m tra m\u1eabu<\/h3>\n
      \n
    1. \n
      \u0110i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m \u0110i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m tham chi\u1ebfu cho quang ph\u1ed5 h\u1ea5p th\u1ee5 nguy\u00ean t\u1eed ng\u1ecdn l\u1eeda: | Th\u00f4ng s\u1ed1 | Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt | | B\u01b0\u1edbc s\u00f3ng | 766.5 nm | | B\u0103ng th\u00f4ng quang ph\u1ed5 | 0.2 nm | | \u0110\u00e8n nguy\u00ean t\u1ed1 D\u00f2ng \u0111i\u1ec7n | 2.0 mA | | Chi\u1ec1u cao \u0111\u1ed1t | 5 mm | | T\u1ed1c \u0111\u1ed9 d\u00f2ng ch\u1ea3y kh\u00ed nhi\u00ean li\u1ec7u | 1500 mL \/ ph\u00fat | | \u00c1p su\u1ea5t m\u00e1y n\u00e9n kh\u00ed | 0.22 MPa |<\/div>\n<\/li>\n
    2. \n
      Ki\u1ec3m tra m\u1eabu Gi\u1edbi thi\u1ec7u c\u00e1c gi\u1ea3i ph\u00e1p chu\u1ea9n kali v\u00e0o m\u00e1y phun ng\u1ecdn l\u1eeda theo th\u1ee9 t\u1ef1 t\u0103ng n\u1ed3ng \u0111\u1ed9 v\u00e0 \u0111o gi\u00e1 tr\u1ecb h\u1ea5p th\u1ee5. V\u1ebd m\u1ed9t \u0111\u01b0\u1eddng cong ti\u00eau chu\u1ea9n v\u1edbi n\u1ed3ng \u0111\u1ed9 kh\u1ed1i l\u01b0\u1ee3ng kali trong c\u00e1c gi\u1ea3i ph\u00e1p chu\u1ed7i ti\u00eau chu\u1ea9n nh\u01b0 abscissa v\u00e0 c\u00e1c gi\u00e1 tr\u1ecb h\u1ea5p th\u1ee5 t\u01b0\u01a1ng \u1ee9ng nh\u01b0 t\u1ecda \u0111\u1ed9.<\/div>\n<\/li>\n<\/ol>\n

       <\/p>\n

      Trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n th\u00ed nghi\u1ec7m t\u01b0\u01a1ng t\u1ef1 nh\u01b0 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c gi\u1ea3i ph\u00e1p ti\u00eau chu\u1ea9n, l\u1ea7n l\u01b0\u1ee3t \u0111\u01b0a gi\u1ea3i ph\u00e1p tr\u1ed1ng v\u00e0 gi\u1ea3i ph\u00e1p th\u1eed nghi\u1ec7m m\u1eabu v\u00e0o m\u00e1y phun t\u1eed, \u0111o gi\u00e1 tr\u1ecb h\u1ea5p th\u1ee5 t\u01b0\u01a1ng \u1ee9ng c\u1ee7a ch\u00fang v\u00e0 th\u1ef1c hi\u1ec7n \u0111\u1ecbnh l\u01b0\u1ee3ng b\u1eb1ng c\u00e1ch so s\u00e1nh v\u1edbi c\u00e1c chu\u1ed7i ti\u00eau chu\u1ea9n.<\/div>\n

      3.3 T\u00ednh to\u00e1n k\u1ebft qu\u1ea3<\/h3>\n
      H\u00e0m l\u01b0\u1ee3ng kali trong m\u1eabu \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c sau:<\/div>\n

      \"\"<\/p>\n

      \u1ede \u0111\u00e2u:<\/div>\n
        \n
      • X<\/span>\u00a0= H\u00e0m l\u01b0\u1ee3ng kali trong m\u1eabu, \u0111\u01a1n v\u1ecb: miligram m\u1ed7i kilogram (mg \/ kg);<\/li>\n
      • (rho)<\/span>\u00a0= N\u1ed3ng \u0111\u1ed9 kh\u1ed1i l\u01b0\u1ee3ng kali trong dung d\u1ecbch th\u1eed nghi\u1ec7m m\u1eabu, \u0111\u01a1n v\u1ecb: microgram m\u1ed7i milil\u00edt (\u03bcg \/ mL);<\/li>\n
      • (rho_{0})<\/span>\u00a0= N\u1ed3ng \u0111\u1ed9 kh\u1ed1i l\u01b0\u1ee3ng kali trong dung d\u1ecbch tr\u1ed1ng, \u0111\u01a1n v\u1ecb: microgram m\u1ed7i milil\u00edt (\u03bcg \/ mL);<\/li>\n
      • V<\/span>\u00a0= Kh\u1ed1i l\u01b0\u1ee3ng dung d\u1ecbch m\u1eabu ti\u00eau h\u00f3a sau kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i, \u0111\u01a1n v\u1ecb: milil\u00edt (mL);<\/li>\n
      • f<\/span>\u00a0= Y\u1ebfu t\u1ed1 pha lo\u00e3ng c\u1ee7a dung d\u1ecbch m\u1eabu ti\u00eau h\u00f3a;<\/li>\n
      • m<\/span>\u00a0Kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1eabu, \u0111\u01a1n v\u1ecb: gram (g).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

        1. Method Overview After the sample is digested, it is atomized by the flame of an atomic absorption spectrometer, and the absorbance is measured at a wavelength of 766.5 nm. Within a certain concentration range, the absorbance value is proportional to the potassium content, and quantification is performed by comparison with a standard series. 2. […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[36,73],"tags":[],"class_list":["post-3888","post","type-post","status-publish","format-standard","hentry","category-applications","category-food-and-drugs"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/posts\/3888","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/comments?post=3888"}],"version-history":[{"count":0,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/posts\/3888\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/media?parent=3888"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/categories?post=3888"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/tags?post=3888"}],"curies":[{"name":"WP","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}