TCVN r isu CHuAN QUOC GIA

TCVN 11889:2017XuAt ban IAn 1

GAO THO'M TRANG•

Aromatic milled rice

HANOI- 2017

TCVN 11889:2017

Lai noi diu

TCVN 11889:2017 do Cue Ch~ bi~n va Phat trilm thl trU'cmgNang sanbien soan, Bo Nang nghiep va Phat tri~n nang than d~ nghi, TOngCI,ICTieu chuan £)0 lU'cyngChat 1U'Q'ngtham djnh, Bo Khoa hQCva Cang nghecang bo.

3

TIEU CHuAN QUOC GIA TCVN 11889:2017

G~othom tr~ngAromatic milled rice

1 Pham vi ap dvng

Tieu chu~n nay ap dl,mg cho cac loai g~o thorn tdmg thucc Ioai Oryza sativa L. c6 hU'O'ngthorn tvnhien (xem Phu luc A).

2 Tai li~uvi~ndin

Cac tal li$u vien d~n sau r~t c~n thi~t cho viec ap dl,Jngtleu chuan nay. 86i v&i cac tal Ii$u vien d~n ghi

narn cong b6 thl ap dl,Jng phien ban dU'Q'cneu. 86i v&i cac tal Ii$u vien d~n khong ghi narn cong b6 thl

ap dl,Jngphien ban m&i nhat, bao g6m ca cac sua d6i, b6 sung (neu c6).

TCVN 5643: 1999 G~o - Thu~t ngCf va c1inhnghTa.

TCVN 5716-1 (ISO 6647-1) G~JO- Xac c1inhham 1l1'9ngamyloza - Ph~n 1: Pluronq phap chuan.

TCVN 5716-2 (ISO 6647-2) G~o - Xac c1inhham lU'Q'ngamyloza - Ph~n 2: Phwng phap thl1'&ngxuyen.

TCVN 7087:2013 (CODEX STAN 1-1985, with Amendment 2010) Ghi nhan tbuc pham bao g6i san.

TCVN 7596:2007 (ISO 16050:2003) Thl,l'cpham - Xac c1inhaflatoxin B11 va ham 1l1'Q'ngtong s6 aflatoxin

B11 B21 G1 va G2 trang ngD c6c, cac IOf)i h~t va cac san ph am cua chung - Phl1'O'ngphap sc1cki longhi~u nang cao.

TCVN 7601 :2007 Thl,l'cpham - Xac c1inhham 1l1'Q'ngasen bang phl1'ong phap b~c dietyldithiocacbamat

TCVN 7602:2007 Thl,l'c pham - Xac c1inh ham 1U'Q'ngchi bang phl1'O'ng phap quang pho hap thf./nguyen tif.

TCVN 7603:2007 Thl,l'c pham - Xac c1inhham 1l1'9'ngcadimi bang phl1'O'ng phap quang pho hap thf./nguyen tif.

TCVN 8369:201 0 G~w tr~ng - Xac c1jnhc1{)ben gel.

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TCVN 11889:2017

TCVN 8373:2010 G90 trtmg - f){mh gia ch§t lU'ong cam quan cam b~ng phU'ang phap cho cJiflm.

TCVN 9027:2011 (ISO 24333:2009) NgO coc va san phf1m ngO coc - L§y mau.

TCVN 11888:2017 G90 tr~ng.

ISO 712 Cereals and cereal products - Determination of moisture content - Routine reference method

(NgO coc va cac san phf1m til' ngO cDc - Xac ajnh 00 ~m - Phironq phap aoi ch&ng thong dl,mg).

3 Thuat ngw va djnh nghia

Trong tieu chuan nay SLPdunq cac thuat ngt}, dinh nghia neu trong TCVN 5643: 1999 va thuat ngt}, dinhnghia sau:

3.1

G~o thorn trc1ng (aromatic milled rice)

G<;IOtr~ng (qao xat) c6 hvonq thorn tl,J'nhien d~c tru'nq phu thuoc vao gi6ng lua va thai gian bao quan,

4 Phan h~ng chat 1lJ'Q'ng

G<;Iothorn tr~ng dU'Q'cphan thanh cac h<;lngchat 1U'Q'ngneu trong Bang 2 va nhu sau:

- 100 %;

- 5 %,10 % va 15 %.

5 Yeu c&u ky thu~t

5.1 Cac chi tieu cam quan cua g<;lothorn tr~ng dU'Q'cquy dinh trong Bang 1.

Bang 1 - Yeu c~u cam quan

Ten chi tieu Yeu c~u

1. Mau s~c Mau tr~ng d~c trU'ng cho tLfng gi6ng

2.Mui,vi Mui thO'm tl,J' nhien d~c trU'ng cho tCrng gi6ng va

khong c6 mui, vi 1<;1

3. Con trung s6ng nhin th~y b~ng m~t thU'ang Khong dU'Q'cco

5.2 Cac chi tieu ch~t 1U'Q'ngcLla g<;lothO'm tr~ng dU'Q'cquy dinh trong Bang 2.

6

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uou U091 u.o4 U~I ljuex 6u94.n4 ::>8q 6U?A + 9-P ::>OS184 Q4u ugAn6u ww 0'9>7 WWO'L <76U94:>1 u.o4 u0916u94:>1 l8H l8H !q 18H l8H 18H +Q-Pl8H W!{.l WIf.l 18H 'u~6u l8H '!?P l!{J l8H'6u.6.n1 U0916U94>1 '6u.6.n1

l~x !94>1% '6:>1/l849s !94:>1% uou U0916U94:>1'6u.6.n1 !94:>1% 6u.6.n1 !94:>1% 6u.6.n1 !94:>1% oe6 oe6Od)W 'w~QG 'U~I :>94.1 'l~4:> de_l ':>~4>tle4 !eOI :>~:::> 'Je4 eJ;1:>U~4d 4u'?4.1 '!,?pn~!4:> 004lle4 ~I ~_l 6ueH w94N

TCVN 11889:2017

6 Yeu cAu v~ an toan th,!c ph~m

6.1 PhV gia thl:l'C pham

SLi' dl,lng cac phu gia thuc pharn theo quy dinh hien hanh [1][21.

6.2 ThuOc bao v~ thl:l'C v~t

Gao thorn trang kh6ng duoc co du 1U'Q'ngthu6c bao v$ thuc vat earn sLi'dl,lng theo quy dlnh hien hanh [3][41.

M(fc gi&i han t6i da du' 1U'Q'ngthuoc bao v$ thuc vat cho phep co trong 9iilo thorn trang theo quy dinhhien hanh[51.

6.3 Kim lo~i n~ng

Ham 1U'Q'ngt6i da kim loai n~ng trong 9i;lo thorn trang dU'Q'cquy dlnh trong Sang 3 [61.

Bang 3 - Ham 1lJ'Q'ngtOi da kim leal n~ng

TEm chi tieu MLPCtOi da

1. Ham 1U'Q'ngcadimi, mg/kg 0,4

2. Ham 1U'Q'ngasen, mg/kg 1,0

3. Ham 1U'Q'ngchi, mg/kg 0,2

6.4 DQc to vi nAm

Ham 1U'Q'ngt6i da doc t6 vi nam trong 9i;lo thorn trang duoc quy dinh trong Sang 4 [71.

Bang 4 - Ham 1lJ'Q'ngt6i da dQc t6 vi nam

Ten chi tieu MLPCt6i da

1. Ham 1U'Q'ngaflatoxin 81, j.Jg/kg 5

2. Ham 1U'Q'ngaflatoxin t6ng s6, j.Jg/kg 10

7 PhlJ'O'ngphap thw

7.1 Lay mau, theo TCVN 9027:2011 (ISO 24333:2009).

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TCVN 11889:2017

7.2 Chu§n b] m~u thu.

7.2.1 Thi~t b], dl,lng cl,l

7.2.1.1 Dl,lng cu chia mau, loai hinh n6n hoac loai nhieu ranh c6 h$ thong phan phoi [tham khaoTCVN 9027:2011 (ISO 24333:2009)].

7.2.2 Cach ti~n hanh

TCrm~u da I~y theo 7.1, I~y ra khoang 3 kg. Dung dl,mg Cl,Jchia m~u (7.2.1.1) I~y 1,5 kg lam m~u tht}

nqhiern, 1,5 kg con Ic;lidung lam rnau luu. St} dl,Jngcac hop dl,mg m~u c6 nap d$y kin.

Tron ky m~u tht} nghi$m d~ c6 dO d6ng dE§ucao nhat, Sau d6 ti~n hanh I~y m~u nh6 hon, n~u can, dung

dl,mg Cl,Jchia m~u (7.2.1.1) d~ thu duoc cac phan m~u tht} c6 khoi IU'Q'ngthich hop (xem Phu luc 8).

7.3 Danh gia cam quan

Trong thoi gian chuan b] rnau, can luu y phat hi$n xem c6 rnui la hay mui d~c biet hoac con trung song

trong khoi gc;lohay khong. Ghi chep tai t~t ca cac nh$n xet vE§mau s~c, mui, vi va so 1U'Q'ngcon trungsong nhin th~y bang m~t thU'6'ng.

7.4 Xac dinh dQ am, theo ISO 712.

7.5 Xac dinh mLPcxat, theo Phl,J ll,Jc8 cLla TCVN 11888:2017.

7.6 Xac dinh cac chi tieu chat IlJ'Q'ng, theo Phl,Jll,JcC.

7.7 Xac dinh ham 1lJ'Q'ngamyloza, theo TCVN 5716-1 (ISO 6647-1) ho~c TCVN 5716-2 (ISO 6647-2).

7.8 Xac dinh dQ b~n gel, theo TCVN 8369:2010.

7.9 Xac dinh mLPCdQ thO'm clla cO'm, theo TCVN 8373:2010.

7.10 Xac dinh ham 1lJ'Q'ngcadimi, theo TCVN 7603:2007.

7.11 Xac dinh ham 1lJ'Q'ngasen, theo TCVN 7601 :2007.

7.12 Xac dinh ham 1lJ'Q'ngchi, theo TCVN 7602:2007.

7.13 Xac dinh ham 1lJ'Q'ngaflatoxin 81, theo TCVN 7596:2007 (ISO 16050:2003).

7.14 Xac dinh ham 1lJ'Q'ngaflatoxin t6ng 56, theo TCVN 7596:2007 (ISO 16050:2003).

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TCVN 11889:2017

8 Bao bi, ghi nhan, bao quan va v~n chuy~n

8.1 Bao bi

8ao bl dl,l'ngg~o thorn tr~ng pha. dU'Q'clam ttYvat lieu phu hop cho rnuc dlch Slr dl,lngva khong co muilam anh hU'<1ngd~n san pham, 8ao bl phai kho, sach, nguyen ven, b~n, bao dam an toan thuc pharn,Gao thorn tr~ng dU'Q'cdong trong bao bl v&i cac kh6i 1U'Q'ngthlch hop.

8.2 Ghi nhan

8.2.1 Bao bi d~ ban h~

Ngoai cac quy dlnh trong TCVN 7087:2013 (CODEX STAN 1-1985, with Amendment 2010), can co cacthong tin sau day:

- Ten san pharn phai duoc ghi ra "Gao thorn tr~ng" va ten cua gi6ng Ilia.

- Kh6i 1U'Q'ngtinh.

- Ten va dia chi nha san xuat, dong goi hoac ngU'aiban Ie.

- Xuat xLf hang hoa.

- Nhom/loai/hanq chat 1U'Q'ng.

- Ngay san xuat hoac ngay d6ng goi.

- Han Slr dunq.

- HU'&ngdan bao quan.

8.2.2 Bao bi kh6ng dung d~ ban h~

Thong tin d6i v&i bao bl khong dung dll ban Ie phai dU'Q'cghi tren bao bl ho~c trong tai li$u kem theo,vi$c nh~n bi~t 10hang, ten va dia chf cLla nha san xu~t ho~c ngU'ai dong goi phai thll hi$n tren bao bi.

Tuy nhien, vi$c nh~n bi~t 10hang, ten va dia chi cLlanha san xu~t hay ngU'aid6ng goi co th~ dU'Q'cthayth~ b~ng d~u nh~n bi~t ra rang v&i cac tai li$u kem theo.

8.3 Bao quan

8ao quan g~o thO'mtr~ng trong kho <1d~ng dong bao d~ tren bl,lc ke ho~c bao quan trong silo, khongbao quan <1d~ng d6 rai tren san kho.

Kho bao quan phai kin, tranh dU'Q'cSl,l'xam nh~p cLlacon trung va dong v~t gay h~i. Mai kho, san vatU'angkho dam bao ch6ng th~m, ch6ng ~m.

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TCVN 11889:2017

Truoc khi chua g<;lO,kho phai dLl'Q'cquet don, lam v$ sinh sach se: san, tLl'ang kho, buc ke phai duockhlr trLlng b~ng cac loai h6a chat duoc phep SLl' dunq theo quy dinh hien hanh.

L6 g<;lodLl'Q'cxep each tLl'ang It nhat la 0,5 m. Khoanq each giCPahai 16It nhat la 1 m d~ thuan tien choviec di lai ki~m tra, I~y mau va xLI' IY.

Bao g<;loxep thanh tCmg 16,moi 16kh6ng qua 300 tan. Trong moi 10,g<;lodLl'Q'cx~p theo cLIng h<;lngchat

ILI'Q'ng,cLIng loai bao bi, khong chat cao qua 15 lop. Lo g<;loduoc xep th~ng hang, vuong g6c v&i sankho d~ khong bi d6.

ThLl'ang xuyen lam v$ sinh nha kho, v$ sinh cac 16hang, m6i trLl'ang xung quanh kho; kh6ng d~ nuocdqng xung quanh nha kho.

8.4 V~n chuyen

PhU'O'ngtien van chuyen g<;lothO'm tr~ng phai dam bao duy trl dU'Q'cch~t 1U'Q'ngcua san ph~m. Khong

v~n chuy~n g<;lothO'm tr~ng Ian v&i cac hang hoa khac c6 th~ anh hLl'<Yngd~n ch~t ILI'O'ngcua g<;lo.

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TCVN 11889:2017

Phu Iuc A

(tham khao)

D~cdi~mmQt s6 loal g~o thorn tr&ng

. D~cdi~m Ten gi6ng lua thorn

B~cthorn ST20 RVT Jasmine 85 Nang hoa 9 VD20s67

1. Chi~u dai trung blnh hat g<;lO,mm 5,6.;. 5,7 7,4.;. 7,5 6,5.;. 6,7 6,8.;. 7,0 6,8 .;.7,0 6,3.;.6,4

2. Ty I~ chieu dailchi~u r¢ng cua 2,6 .;.2,8 3,4.;. 3,6 3,3 .;.3,5 3,1.;. 3,3 3,1.;. 3,3 2,6 .;.2,8h<;ltg<;lo

3. Ham 1U'Q'ngamyloza, % khoi 14.;. 18 14.;. 20 15.;. 20 14.;. 19 15.;. 21 17.;. 191U'Q'ngtal d¢ am g<;lO14 %

4. f)¢ b~n gel M~m Mem M~m Mem M~m Mem

5. Mlic d¢ thorn cua corn (diem) ;::3 ;::3 ;::3 ;::3 ;::3 ;::3

12

Phv luc B(quy dinh)

Quy trinh phan tich g~o thorn tr~ng

Mau ban d~u

TCVN 11889:2017

Kiem tra rnui va cOn trung

Ph~n mau thLY3(200 g)

Mau chung

Phan mau thLY1(500 g)

- Tap chat- Thoc Ian

Mau thLYnqhiern(~ 1,5 kg) Xac djnh d¢ ~m

Ph~n mau thLY2(3 x 50 g)

Xac dlnh rrurc xatH~tnguyen Tarn Tarn nho

Hat nguyen VE;!n

Xac dinhkich thU'GChat

Ph~n mau thLY4(100 g)

- Hat do- Hat SQC do- Hat xat d6i- Hat vanq- Hat bac phan- Hat b] hU' hong- Hat xanh non- Hat Ian loai

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TCVN 11889:2017

PhlJ luc C(quy dinh)

PhU'O'ngphap xac djnh mlPc xat

C.1 Nguyen ~c

Khi ngam mau g<;lotrong h6n hop dung dlch kali hydroxit va etanol, hat g<;loxat d6i se co rnau nau sangtrong khi hat g<;loxat ky co mau vanq nhat. Dung kfnh lup d~ nhat rieng cac hat xat d6i ra khoi rnauCan CLrvao ti I~ hat g<;loxat d6i co trong mau d~ suy ra rrurc xat cua g<;lo.

C.2 Thu6c thw

C.2.1 Kali hydroxit, danq tinh th~, loai tinh khiet.

C.2.2 Etanol, 96 % (th~ tlch),

C.2.3 H6n hQ'pdung djch kali hydroxit va etanol

Dung 250 ml nuoc cat d~ hoa tan 5 9 kali hydroxit (C.2.1) dl,mg trong blnh cau dung tlch 1 llt, cho750 ml etanol (C.2.2) vao blnh cau va lac kyo

C.3 Thi~t bj, dlJng CIJ

SLYdunq cac thiet b], dl,lngCl,lphcnq thLYnghi~m thong thU'ongva cu th~ nhu sau:

C.3.1 Kinh lup, do phong dal 5 Ian den 12 Ian.

C.3.2 Kep g~p hat,

C.3.3 HQppetri, dU'ong kfnh 90 mm.

C.3.4 £)la thuy tinh ho~c dia Slv.

C.3.S Sinh cAu, dung tfch 1 1ft.

C.3.6 6ng dong, dung tfch 100 ml ho~c 50 ml.

C.3.S Can, co do chfnh xac den 0,01 g.

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C.4 Cach ti~n hanh

TCY phan rnau thl} 2 (xem Phu luc B), I~y 3 mau, mai mau 50 g. Voi mai mau, I~y ngau nhien 100 hat

g<;10nguyen cho vao hop petri (C.3.3). R6t 20 ml han hop dung dich kali hydroxit-etanol (C.2.3) vao hOp

petri cho ng~p hoan toan mau. 8~y kin va d~ yen trong 30 min. G<;1nbe h~t dung dlch va chuyen toan

b¢ g~o len gi~y toe (C.3.7), d~ trong 5 min cho kh6 tl,l' nhien. Hat g~o xat d6i (con cam) se c6 rnau nau

sang, hat g~o xat ky (chi con noi nhO) se c6 rnau vanq nhat.

SI} dunq kinh lup (C.3.1) va dung kep (C.3.2) chon t~t ca cac hat c6 rnau nau sang v&i dien tlch lon han

1/4 dien tich bE§mat cua hat hoac nhCmg hat c6 t6ng chieu dal cac SQCnau sang lon han hoac b~ng

chieu dai cua hat g~o va cho vao dTaSLl'ho~c dTathuy tinh s<;lch(C.3.4). Ti~n hanh d~m sO h<;lttrong dTa.

C.s Tinh va bi~u thi k~t qua

Tr 1$h~t g~o xat d6i c6 trong mau g<;lola sO h~t g~o xat dOi d~m dU'Q'c. L~y trung binh cong cua ba k~t

qua phan Uch va lam tron s6 d~n hang dan vi. So sanh k~t qua thu dU'Q'cv&i Bang C.1 d~ danh giamLl'c xat cLla g<;lo.

Bang C.1 - Danh gia mwe xat ella g~o

Mwe xat Ti I~ h~t g~o xat d6i, %, khong IcYnhan

R~t ky 0

Ky 15

VCYaphai 25

Binh thU'cYng 40

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TCVN 11889:2017

Phu luc 0

(quy dinh)

PhlJ'O'ngphap xac djnh cac chi tleu ch~t 1lJ'Q'ng

0.1 Thi~t b], dl:Jng Cl:J

SLrdl,mgcac thi~t bi, dl,mgCl,Jph6ng thLrnghi$m thong thU'ong va Cl,Jth~ nhu sau:

0.1.1 May phan loal theo kich thuoc hat hoac sang tach t~m.

0.1.2 Sang kim loai, co 10sang trcn, dU'ong kinh 101,0 mm va 1,5 mm, co nap d~y va day thu nhan.

0.1.3 Can, c6 do chinh xac d~n 0,01 g.

0.1.4 Micromet, hoac dl,JngCl,Jdo kich thuoc hat khac khong lam bien d~ng hat va co do chinh xacd~n 0,01 mm.

0.1.5 Khay, hoac vat dl,Jngkhac, c6 rnau tU'O'ngphan v&i rnau cua g~o tr~ng thLrnghi$m.

0.2 Cach ti~n hanh

0.2.1 Xac djnh thee va tap chat Ian

0.2.1.1 Phep xac djnh

TLr phan rnau thLr 1 (xem Phu luc 8), can 500 9 mau, chinh X8Cd~n 0,01 g, cho len sang (0.1.2) c6dU'ong kinh 101,0 mm. L~c tron sang b~ng tay v&i toc do tLr 100 r/min d~n 120 r/min trong 2 min, moi

phut d6i chi~u mot I~n. Nh~t cac t~p chat vo cO'va hCrucO'(1ph~n tren sang gOpv&i ph~n t~p chat nhe

dU'&iday sang cho vao coc thuy tinh kho s~ch, da bi~t tm&c khoi 1U'Q'ng.Can toan bo khoi 1U'Q'ngt~pchat va coc, chinh xac d~n 0,01 g, tLrd6 suy ra khoi 1U'Q'ngt~p chat, mt.

86 ph~n mau con I~i tren sang (sau khi lo~i be t~p chat) ra khay (0.1.5), ti~n hanh nh$t va d~m so h~tth6c Ian trong g~o thO'mtr~ng.

0.2.1.2 Tinh k~t qua

0.2.1.2.1 TT1$t~p chat, Xt, tinh b~ng ph~n tram khoi 1U'Q'ng,theo cong therc (0.1):

(0.1)

trong d6

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TCVN 11889:2017

m, la tong kh6i 1U'c;>'ngtap chat, tinh bang gam (g);

m la kh6i 1U'(;mgphan rnau thLY1, tinh bang gam (g).

0.2.1.2.2 TT1$thee Ian duoc tinh bang s6 hat th6c c6 trong 1 kg gGlO,nghia la I~y s6 hat th6c demduoc (0.2.1.1) nhanv&i 2.

0.2.2 Xac dinh hat nguyen, tam va tam nh6

0.2.2.1 Phep xac dinh

TCrphan mau thLY3 (xem Phu luc B), can 200 9 mau, chinh xac den 0,01 g. LOGlibe th6c va tap chat

(xem 0.2.1.1), sau d6 dung sang (0.1.2) c6 dU'ang kinh 161,5 mm dll tach tarn man. Dung may phan

IOGlitheo kich thuoc hat (0.1.1) dll tach rieng phan hat nguyen, phan t~m va phan t~m nhe. Neu khong

c6 may phan IOQitheo kich thuoc hat, c6 thll SLYdl,lng sang tach tam thich hop dll tach so be>phan hat

nguyen va tam, sau d6 dan deu tung phan tren khay (0.1.5) va nhat nhCmg hat gGlOnguyen Ian trong

tam hoac tam Ian trong hat nguyen, neu c6. Phan rieng tam nhe theo kich trurcc tU'O'ng(mg.

Can cac phan da phan rieng nhU' tren, chinh xac den 0,01 g.

0.2.2.2 Tinh ket qua

a) TT1$hQt nguyen, X1, tinh bang phan tram kh6i lU'qng, theo cong thlfC (0.2):

X m11 =-x100m (0.2)

trong d6

m1 113kh6i 1U'Q'nghQt nguyen, tinh bang gam (g);

m 113kh6i 1U'Q'ngph~1nmau thLY3, tinh bang gam (g).

b) TT1$tam, X2, tinh bang phan tram kh6i 1U'c;>'ng,theo cong thlfC (0.3):

X2 = m2 x 100 (0.3)m

trong d6 m2 113kh6i 1U'Q'ngt~m, tinh bang gam (g).

c) TT1$t~m nhe, X3, tinh bang ph~1ntram kh6i 1U'Q'ng,theo cong thlfC (0.4):

mX3 = _3 x100m (0.4)

trong d6 m3 113kh6i 1U'c;>'ngt~m nhe, tinh bang gam (g).

0.2.3 Xac dinh kich thU'cYc h~t

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0.2.3.1 Phep xac dinh

Trong phan hat nguyen (xem 0.2.2.1), I~y ngau nhien 2 mau, m6i mau 100 hat g~o thorn tr~ng nguyen

ven. Dung dl,mg CI,J do kfch thuoc (0.1.4) d~ do chieu dai tLi'ng hat. Tfnh gia tri chieu dai trung blnh hatcua m6i mau (L1 va L2)'

0.2.3.2 Tinh k~t qua

Chieu dai trung blnh hat dU'Q'ctfnh theo cong thLrc (0.5):

(0.5)

N~u gia tr] L1 ~ L2 X 100 Ian hon 2 thl tra lai toan bo s6 hat vao khay va ti~n hanh lap I~i theo 0.2.3.1.

0.2.4 Xac djnh hat do, hat SQC do, hat xat d6i, hat vang, hat bac phan, hat b] hlP hong, hat xanhnon, hat Ian lo~i

0.2.4.1 Phep xac djnh

ro phan mau thLr 4 (xem Phu luc B), can 100 9 mau, chlnh xac d~n 0,01 g. Loai bo th6c va tap chat

(xem 0.2.1.1), sau d6 d6 toan bo g~o len khay men tr~ng, dan d~u mau va ti~n hanh phan lo~i h~t

bang cach nhcjltvao cac c6c thuy tinh s~ch d§ bi~t trU'ac kh6i 1U'Q'ngtLi'ng lo~i h~t: h~t do, h~t soc do,

h~t xat d6i, h~t vang, h~t b~c ph~n, h~t bi hU' hong, h~t xanh non, h~t Ian lo~i. Can rieng tLi'ng c6c chLra

cac lo~i h~t, chinh xac d~n 0,01 g, tLi' d6 suy ra kh6i 1U'Q'ngtLi'ng lo~i h~t.

0.2.4.2 Tinh k~t qua

TT1$tLi'ng lo~i h~t (Xi), tfnh bang phan tram kh6i 1U'Q'ng,theo cong thLrc (0.6):

X· =!!!..L x 100I m (0.6)

trong d6

mj la kh6i 1U'Q'ngtLi'ng lo~i h~t, tfnh bang gam (g);

m la kh6i 1U'Q'ngmau can, tfnh bang gam (g).

K~t qua phep thLr la gia trj trung blnh cLla hai Ian X8C dinh, tfnh d~n mot chCl's6 th~p phan.

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ThlJ' muc tal Ii~u tham khao

[1] Thong tU'56 27/2012ITT-SYT ngay 30 thanq 11 narn 2012 cua So trU'cYngSo Y tt§ hU'ang dfin viecquan Iy phu gia thuc pham.

[2J Thong tu so OS/2015ITT-BYT ngay 11 tMng 5 narn 2015 cua BOtrU'cYngBOY tt§sl}a d6i, b6 sung

mot so quy djnh ella Thong tU"so 27/2012m-BYT nqay 30 thang 11 nam 2012 hU'ang dan viecquan Iy phu gia thuc ph~m.

[3J Thong tu so 03/2016ITT-SNNPTNT ngay 21 tMng 4 narn 2016 cua So trU'cYngBONong nghi$p vaPhat trien nong then ve ban hanh Danh muc thu6c bao v$ thuc vat duoc phep 51} dunq, earn 51}

dl,lng 6' Viet Nam; cong bo ma HS doi voi thuoc bao v$ thuc vat dU'Q'cphep SLr dunq, earn sl}. dl,lng 6' Viet Nam.

-=i

[4] Thong tU'so 06/2017ITT-BNNPTNT ngay 08 thanq 3 narn 2017 cua BOtrU'6'ng Bo Nang nghi$p vaPhat tri~n nong then sua d6i, b6' sung mot so noi dung cLla Thong tU' so 03/20 16m -BNNPTNT

ngay 21 tMng 4 nam 2016 ve ban hanh Danh ml,lC thuoc bao v$ thl)'c v$t dU'Q'cphep SLI' dWng,

cam 51} dl,lng t<;liVi$t Nam; cong bo ma HS dOi vai thuoc bao v$ thL,J'cv$t dU'Q'cphep 51} dwng,

cam su' dung t<;liVi$t Nam.

[5] Thong tU' so 50/2016/TT-BYT rigc3y 30 thang 12 nam 2016 cLla BO trU'ang So Y tt§ quy dinh giai

h<;lntoi da dU'1U'Q'ngthuoc bao vi thl,l'Cv$t trong thL,J'Cph~m.

[6] QCVN S-2:2011/BYT Ouy chuan ky thu~t qu6c gia a6i vai giai h?n 0 nhiem kim lo?i n(mg trong

thl!c pham.~ - " ~ . a~' ,. .., han 0 nhiem aoc t6 vi nam trong[7] QCVN 8-1:2011IBYT Ouy chuan ~y thuc;:Jtquoe gla 01 VO'lglO'I . .

thl!c pham.

[8] CODEX STAN 198-1995 Standard for Rice.

[9] ISO 7301 :2011 Rice - Specification.

[10] TAS 4001-2008 Thai Aromatic Rice (Tieu chu~n Thai Lan).

19