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The world leader in serving science

Proprietary & Confidential

High performance

for milk powder analysis

ARL OPTIM’X Unique WDXRF system

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Application: Food industry

Food industry

• Nutritional Supplements • Multi-element capability:

Mg, K, Ca, Cr, Mn, Fe, Zn, Cu, Se, Mo, Iodine

• High Throughput

• Advanced quantitative algorithms for optimal accuracy

• Excellent repeatability

• When Na and Mg are required, WDX must be used to get the required performance

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Minerals in milk powders

Indications on the box of a milk powder for

baby

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Minerals in milk powders

Indications on the box of a milk powder for baby

Concentrations are expressed in milli grams per 100g

and micro grams per 100g

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ARL OPTIM’X

• Optimized configuration for

optimum analytical results

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Low Power WDXRF

WD-XRF SmartGonio™

Flexible, versatile, elemental analysis

WD-XRF __Multichromators™

Rapid, dedicated routine analysis

ARL Optim’X

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WDX low power

Mini X-ray tube (50W - air cooled)

Close coupling of optics for optimized sensitivity equivalent

to 200 W

Elemental coverage: F to U

X-ray tube

Vacuum tank

Scintillation

counter

Sample holder

Crystal(s)

SmartGonio Flow Proportional

counter

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ARL OPTIM’X Exclusive SmartGonioTM

Access to all elements from F to U

(3 crystals - 2 detectors fitted)

View of the Moiré fringe SmartGonioTM

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Limits of detection in milk powders

Milk powders prepared as pressed pellets - n.m.=not measured

Element Concentration

range

in milk powders

LoD

SmartGonio

t=60s

(ppm)

LoD

Fixed channel

t=120s

(ppm)

Ca 0 – 1.6 % 10 n.m

Cl 0 – 0.48 % 10 n.m.

Cu 0 – 0.012 % 0.6 n.m.

Fe 0 – 0.33 % 2.1 n.m

K 0 – 1 % 2 n.m

Mg 0 – 0.12 % n.m. 22

Mn 0 – 0.0023 % 1.2 n.m.

Na 0 – 0.03 % n.m. 42

P 0 – 1.1 % 4.4 n.m

Se 0 – 3.4 ppm 0.24 n.m.

Zn 0 – 0.2 % 2 n.m.

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Calibration curves for milk based products: Na, Mg

ARL Optim’X

29 milk based product samples

In this study Na and Mg have

been measured on fixed

channels using sealed detectors

Total Analysis time 10’

The new version of the

SmartGonio (3 crystals) allows

analysis of Na and Mg

Copyright 2004 John Wiley & sons – X-ray spectrom. 2004, 33: 128-135

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Calibration curves for milk based products: P, S, Cl

ARL Optim’X

29 milk based product samples

60s counting time per element

Correction with Rh Compton

ratio

Copyright 2004 John Wiley & sons – X-ray spectrom. 2004, 33: 128-135

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Calibration curves for milk based products: K, Ca, Fe, Zn

Co

pyri

gh

t 2004 J

oh

n W

iley &

so

ns –

X-r

ay s

pectr

om

. 2004, 33:

128

-135

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Milk-based products: Fe repeatability

Iron in milk powder

• Short term repeatability (120 s)

• Standard Deviation: 1.2 ppm at 94 ppm Fe level

9390

94 93 93 94 93 94 93 94

40

45

50

55

60

65

70

75

80

85

90

95

100

105

110

115

120

0 1 2 3 4 5 6 7 8 9 10 11

Run nr.

Co

nce

ntr

ati

on

Fe

(p

pm

)

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Milk-based products: Ca repeatability

Calcium in milk powder

• Short term repeatability (120 s)

• Standard Deviation: 0.026% at 0.75% level Ca

0.66

0.67

0.68

0.69

0.7

0.71

0.72

0.73

0.74

0.75

0.76

0.77

0.78

0.79

0.8

0 2 4 6 8 10

Run nr.

Co

nce

ntr

ati

on

(%

)

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Repeatability of analysis in milk powders

Milk powders prepared as pressed pellets

Element Analytical

Device

Concentration

level of sample

used for

precision test

Precision

(1 sigma)

in 6 runs of the

same pellet

Ca SmartGonio 3860 ppm 33 ppm in 60s

Cu SmartGonio 5 ppm 0.2 ppm in 60s

Fe SmartGonio 60 ppm 2 ppm in 60s

K SmartGonio 6000 ppm 44 ppm in 60s

Mg Fixed channel 500 ppm 11 ppm in 240s

Na Fixed channel 2400 ppm 28 ppm in 240s

P SmartGonio 2600 ppm 18 ppm in 60s

Zn SmartGonio 50 ppm 0.7 ppm in 60s

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Conclusions

• With ARL Optim’X, WDXRF is becoming a standard

technique for the analysis of various elements in milk-based

products

• Different analytical methods are used for optimum accuracy

• The new 200W version of ARL Optim’X can be a good

alternative

• to avoid fitting of Na and Mg fixed channels

• Or to increase the speed of analysis if Na and Mg fixed channels are

fitted

• Higher power instruments (ARL PERFORM’X series) are only

necessary for the most demanding cases

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