JP2010185799A - Instrument and method for measuring cod of rice washing water by optical system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instrument for measuring the COD of rice washing water by an optical system capable of obtaining the COD value of the rice washing water with high precision by making an environmental temperature constant when measuring the COD of the rice washing water and dispensing with the correction of temperature. <P>SOLUTION: The instrument 1 for measuring the COD of the rice washing water by the optical system has a test tube 2 housing a definite amount of a rice sample, a water supply device 3 with a heat insulating function for supplying water of constant temperature, an ultrasonic washing device 4 with a heat insulating function for performing the suspension to the rice sample in a sample housing means at constant temperature, a strainer 5 and a cell 6 both of which strain the suspended rice sample to obtain the washing water of the rice sample, an optical measuring means 7 for measuring absorbance with respect to the washing water of the rice sample, and a COD operating processing means 8 calculating the COD value of the washing water of the rice sample on the basis of the measuring signal by the optical measuring means 7 and outputting an operation result. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rice polishing soup optical system that can maintain a constant environmental temperature at the time of COD measurement of rice sharp soup and eliminates temperature correction to obtain a highly accurate COD measurement method and method. It is about.

  The COD measurement value of white rice “sharp soup” is influenced by the concentration of the sharp soup. This is because white rice sharpening juice generally contains organic substances, mainly sugars.

  The correlation between the amount of organic matter in the rice sharpening juice and the measured COD is an important feature in evaluating the quality of rice. However, it is empirically known that the organic matter concentration of this sharpening juice is also affected by the suspension method and the grain temperature and water temperature during suspension.

  Therefore, when estimating COD measurement values, (1) Suspension method (in the case of shaking: stroke distance, period and processing time, etc., in the case of aeration: air flow rate, aeration method and time, etc.) was made constant. In addition, (2) the relationship between the sample temperature (the grain temperature and the temperature of the polishing water) and the measured COD value had to be made clear.

  This is to obtain the “correction term by temperature” in advance, and various white rice samples are prepared for the evaluation, and the combination test is conducted in the temperature environment within the control range. The relationship is complex and error is likely to propagate, making it difficult to obtain a highly accurate correction formula.

  In addition, the assembly of the evaluation test itself has increased the number of combinations of the sample and the temperature, and it took much effort, and at the same time, it was difficult to analyze the correction function.

  The present applicant has developed the following as a technique specialized in COD measurement of a suspension at the time of washing with white rice.

  In this technique, approximately 5 g of white rice sample is placed in a dedicated test tube, and 25 mL of distilled water whose temperature is monitored by a thermistor is injected and suspended for a certain period of time. A sample is used as a test sample.

  Then, an optical measurement device is used to calculate a correction term calculated based on the optical signal from the test sample and the distilled water temperature, and the COD measurement value in an environment corresponding to the distilled water temperature of 20 ° C. is estimated.

  In calculating the correction terms, (1) the type of white rice (regularly polished rice: new rice, old rice, intermediate products, etc., non-washed rice: BG, TWR, Kriki, Kapika, etc.), (2) as shown in Fig. 6 The calculation is performed using one stabilized in several temperature environments (for example, 5 ° C., 10 ° C., 20 ° C., 30 ° C., etc.).

  At this time, the supplied distilled water temperature is measured with a thermistor, and it is assumed that the time has passed sufficiently under the room temperature environment, and the room temperature, instrument temperature, sample grain temperature, and distilled water temperature are considered to be the same. ing.

Since the calculation of the correction formula is based on data obtained by changing the test sample and the environmental temperature, calculation errors are mixed in. Although the correction term has an approximately linear relationship, a simple linear relational expression includes an error. Since this is forcibly linearly corrected, errors increase.
In general, when the water temperature and the sample temperature change, the “suspension concentration” changes. If this is corrected, an error will occur.
An example will be described with reference to FIG. 6. In FIG. 6, A to G show COD measurement results when seven different polished rices are suspended at respective water temperatures. FIG. 6 shows that the sample with a small COD measurement value and the sample with a large amount have different sensitivity (straight line) with respect to temperature.
It can also be seen that a sample with a small COD measurement value is not the same straight line, and the data varies around the straight line.
When trying to process this with a uniform “temperature correction function”, both “difference between the slope and intercept of the straight line” and “error when regressing with a straight line” cause the error.

  Patent Document 1 discloses a food component analyzer that obtains the absorbance of food at a plurality of wavelengths by spectroscopic measurement and analyzes the components contained in the food based on the absorbance. A temperature measuring means for measuring the temperature of itself or the vicinity thereof, an absorbance difference calculating means for calculating a difference in absorbance between predetermined wavelengths, and a temperature change obtained in advance and a fluctuation in absorbance difference between predetermined wavelengths caused by the temperature change. A temperature correction unit that calculates each absorbance difference at a reference temperature from a temperature measured by the temperature measurement unit and a plurality of absorbance differences calculated by the absorbance difference calculation unit, based on a conversion formula representing a relationship; and the temperature There has been proposed a food component analyzer including a quantification unit that estimates a component amount from a plurality of absorbance differences at a reference temperature calculated by a correction unit.

  In the case of this Patent Document 1, temperature correction processing is also performed by calculating temperature difference means for calculating each absorbance difference at the reference temperature, and an error due to correction is also included.

JP 2000-028523 A

  The problem to be solved by the present invention is that, in view of the fact that an error is generated when temperature correction is performed, the environmental temperature at the time of COD measurement of rice sharpening juice is made constant, and errors due to temperature correction are eliminated to obtain a highly accurate COD value. This is the point that there is no COD measuring device based on the optical method of rice soup that can be used.

  The optical polishing method of the rice sharpening juice according to the present invention includes a sample storage means for quantitatively storing rice samples, and simple temperature control throughout the four seasons within a range that does not raise the temperature at which the rice samples become gelatinized. Water supply means for supplying water at a constant temperature and suspension means for suspending the rice sample at a constant environmental temperature that is easy to control temperature throughout the seasons within the range that does not raise the temperature at which the rice sample will gelatinize. And a sharpening juice preparation means that obtains a sharpening juice from the rice sample suspended by the suspension means, an optical measurement means that measures the absorbance of the sharpening juice of the rice sample, and an optical measurement means The main feature is that it has COD calculation processing means for obtaining the COD value of the sharpening juice of the rice sample based on the measurement signal and outputting the calculation result.

  According to the first aspect of the present invention, during the four seasons, at a constant temperature within a range that does not increase the temperature at which the rice sample is gelatinized both during COD measurement, particularly during suspension adjustment and during suspension treatment. Since it is configured to execute the calculation of COD value while imposing the setting condition that temperature management is easy, the calibration curve creation and COD value estimation are highly accurate while eliminating the error due to the difference in temperature condition It is possible to provide a COD measuring apparatus using a rice sharpening soup optical system that can be carried out in a suitable laboratory environment and can be measured with high accuracy in any region of the country throughout the year under an appropriate laboratory environment.

  According to the second aspect of the present invention, during the four seasons, at a constant temperature within a range that does not increase the temperature at which the rice sample is gelatinized both at the time of COD measurement, particularly at the time of suspension adjustment and at the time of suspension treatment. Since it is configured to execute the calculation of COD value while imposing the setting condition that temperature management is easy, the calibration curve creation and COD value estimation are highly accurate while eliminating the error due to the difference in temperature condition If the temperature is maintained at a constant temperature within the range of 35 to 54 ° C. during the preparation of the suspension and the suspension treatment, it can be used throughout the year in an appropriate laboratory environment. It is possible to provide a COD measuring apparatus based on an optical method of rice sharpening so that high-precision measurement is easy in any region.

  According to the third aspect of the present invention, during the four seasons, at a constant temperature within a range that does not increase the temperature at which the rice sample is gelatinized both at the time of COD measurement, particularly at the time of suspension adjustment and at the time of suspension treatment. Since the calculation of the COD value is performed while setting the setting condition that the temperature management is simple, the calibration curve creation and the COD value estimation can be performed with high accuracy while eliminating the error due to the difference in the temperature condition. In addition, it is possible to provide a method for measuring COD by the optical method of rice sharpening juice, which is easy to measure with high accuracy in any region throughout the country under an appropriate laboratory environment.

  According to the invention described in claim 4, the temperature is not increased up to the temperature at which the rice sample is gelatinized at the time of COD measurement, particularly at the time of suspension adjustment and at the time of suspension treatment. Since the calculation of the COD value is calculated while imposing the setting condition of a constant temperature that is easy to manage the temperature, the creation of the calibration curve and the estimation of the COD value are not affected by the difference in temperature condition. It can be performed with high accuracy while draining, and when the temperature of the suspension is adjusted and the temperature of the suspension is set to a constant temperature within the range of 35 to 54 ° C. Thus, it is possible to provide a method for measuring COD using the optical method of rice sharpening juice, which is easy to measure with high accuracy in any region throughout the year.

It is schematic structure explanatory drawing of the COD measuring apparatus by the optical system of the rice soup stock concerning the Example of this invention. It is the schematic which shows the water supply apparatus with a heat retention function in the COD measuring apparatus by the optical system of the rice sharpening juice which concerns on a present Example. It is the schematic which shows the ultrasonic cleaning apparatus with a heat retention function in the COD measuring apparatus by the optical system of the rice soup stock concerning a present Example. It is a block diagram which shows the optical measurement means and the COD arithmetic processing means in the COD measuring apparatus by the optical system of the rice soup stock concerning a present Example. It is a flowchart which shows the process of the COD measuring method using the COD measuring apparatus by the optical system of the rice soup stock concerning a present Example. It is a graph which shows a COD measurement result when different polished rice is suspended under the water temperature of 5-30 degreeC, respectively.

  The present invention provides a COD measuring apparatus using an optical system for rice sharpening so that the environmental temperature at the time of COD measurement of rice sharpening can be kept constant and temperature correction can be eliminated to obtain a highly accurate COD value. It has the purpose.

  The rice sharpening juice optical COD measuring apparatus according to the present invention includes a sample storage means for quantitatively storing rice samples, and a constant temperature within a range of 35 to 54 ° C., which is a temperature below the gelatinization start temperature of rice starch. A water supply means for supplying the water, and a suspension means for suspending the rice sample in the sample storage means at a constant temperature within a range of 35 to 54 ° C., which is a temperature lower than the gelatinization start temperature of rice starch. A sharpening juice preparation means that obtains a sharpening juice of a rice sample by pouring a rice sample suspended in a suspension means, an optical measurement means for measuring absorbance of the sharpening juice of the rice sample, and a measurement by the optical measurement means The above object is realized by a configuration having COD calculation processing means for obtaining the COD value of the sharpening juice of the rice sample based on the signal and outputting the calculation result.

Hereinafter, a COD measuring apparatus and a measuring method based on an optical method of rice sharpening juice according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.
The COD measuring apparatus 1 using the rice sharpening soup optical system according to the present embodiment is characterized in that the basic physicochemical properties of rice starch are qualitative if the starch is within the gelatinization start temperature (54 ° C.), particularly within the range of 35-54 ° C. Based on the viewpoint that the temperature does not change, the sample temperature and the water temperature, which are the temperatures of the test environment, are made constant to eliminate the influence of the temperature difference at the time of suspension and to obtain a highly accurate COD measurement value.

  The COD measuring apparatus 1 based on the optical method of rice sharpening juice according to the present embodiment includes a test tube 2 which is a sample storage means for quantitatively storing rice samples, and water (distilled water) at a temperature not higher than the gelatinization start temperature of rice starch. ) And a water supply device 3 with a heat retention function, which is a water supply means for supplying the water, and an ultrasonic wave with a heat retention function, which is a suspension means for suspending the rice sample in the test tube 2 at a temperature lower than the gelatinization start temperature of rice starch. A cleaning device 4, a strainer 5, which is a sharpening juice preparation means for obtaining a polishing juice of a rice sample by pouring the rice sample suspended in the ultrasonic cleaning device 4, a cell 6 made of a transparent resin, and a rice sample An optical measuring means 7 for measuring the absorbance of the sharpened juice, and a COD calculation processing means 8 for obtaining the COD value of the sharpened juice of the rice sample based on the measurement signal from the optical measuring means 7 and outputting the calculation result. ing.

  The water retaining device 3 with the heat retaining function and the ultrasonic cleaning device 4 with the heat retaining function are employed for the purpose of setting the temperature environment during COD measurement to a temperature that can be managed throughout the four seasons, that is, a temperature that can be managed at room temperature in winter and summer. It is used to impose a setting condition of a constant temperature within a range that does not increase to a temperature at which the rice sample is gelatinized (54 ° C.), particularly within a range of 35 to 54 ° C.

  Specifically, both are set to a constant heat retention temperature within a range of 35 to 54 ° C. As shown in FIG. 2, the water supply device 3 with a heat retaining function includes a water feeder 11 that supplies water in a fixed amount, and a heat retainer 12 that keeps the supplied water in a temperature retaining temperature range of 35 to 54 ° C. Yes.

  As shown in FIG. 3, the ultrasonic cleaning device 4 with a heat retaining function accommodates a test tube fixing cage 13 for fixing and holding a plurality of test tubes 2, and houses the test tube fixing cage 13 at 35 to 54 ° C. And an ultrasonic cleaning device main body 14 that maintains a constant temperature within the range.

  The optical measurement means 7 and the COD calculation processing means 8 will be described with reference to FIG.

  The optical measuring means 7 includes a light source 21 that irradiates the cell 6 with, for example, visible light or ultraviolet light, and a light receiving element 22 that receives light transmitted through the cell 6 containing sharpening juice. Yes.

  The COD arithmetic processing means 8 includes a control unit 30 that performs overall control and a ROM 31 that stores an operation program.

  Then, the control unit 30 takes in the output signal of the light receiving element 22 and generates absorbance data, the absorbance data generation unit 32 that stores the known absorbance data of the sharpened juice stored in advance, and the absorbance data generation unit 32. COD calculation unit 33 that performs processing of known calibration curve data relating to sharpening juice stored in advance and calculation processing by, for example, regression analysis of the COD value of the sharpening juice, based on the absorbance data from, and realizes estimation of the COD value The display 34 and the printer 35 that output the processing results of the COD calculation unit 33 and the input unit 36 that inputs various data are controlled.

  Next, a method for measuring COD by the optical method of rice sharpening juice by the COD measuring device 1 by the optical method of rice sharpening juice according to the present embodiment will be described with reference to FIG.

  First, a predetermined amount of the rice sample is manually weighed (step S1) and supplied to the test tube 2 (step S2). Next, for example, water having a heat retention temperature of 40 ° C. is injected into the test tube 2 from the heat retainer 12 (step S3).

  Next, the test tube 2 is put into a test tube fixing basket 13 and placed in, for example, an ultrasonic cleaning device main body 14 set at a heat retention temperature of 40 ° C. and suspended by the ultrasonic cleaning device main body 14 (step S4). Prepare a sample suspension.

  Next, the test tube 2 is taken out from the ultrasonic cleaning device main body 14, and the suspended rice sample is strained using the strainer 5 to obtain a sharpened juice of the rice sample (step S5).

  Next, only the sharpening juice is put in the cell 6, this cell 6 is set in the optical measuring means 7, the light is irradiated from the light source 21 to the cell 6 and received by the light receiving element 22, thereby optically measuring the sharpening juice. (Step S6), and the output signal of the light receiving element 22 is sent to the COD arithmetic processing means 8.

  Next, in the COD calculation processing means 8, the output signal of the light receiving element 22 is taken in, the absorbance data is generated by the absorbance data generation unit 32, and the known absorbance data of sharpening juice stored and held in advance by the COD calculation unit 33 Based on the absorbance data from the absorbance data generation unit 22, a calibration curve process and a calculation process of the COD value of the sharpening juice are performed to estimate the COD value (step S7).

  Then, the processing result of the COD calculation unit 33 is visually output on the display 34 or the printer 35 (step S8).

  According to the COD measuring apparatus 1 and the COD measuring method based on the rice sharpening soup optical system according to the present embodiment described above, the rice sample is used both during COD measurement, particularly during suspension adjustment and suspension treatment. It is configured so that the final COD value calculation is performed while imposing a setting condition of a constant temperature within a range that does not increase to a temperature at which gelatinization occurs (54 ° C.), particularly within a range of 35 to 54 ° C. Therefore, it is possible to create a calibration curve and estimate the COD value with high accuracy while eliminating the error due to the difference in temperature conditions.

  In addition, if the temperature of the suspension during the suspension process is set to a constant temperature within the range of 35 to 54 ° C., high accuracy can be obtained in any region throughout the year under an appropriate laboratory environment. There is also an advantage that it is easy to measure.

  Furthermore, the necessary additional devices can be added to the conventional device by adding the water supply device 3 with the heat retaining function and the ultrasonic cleaning device 4 with the heat retaining function, and it is easy to upgrade from the conventional device and is adopted in the conventional device. There is also an advantage that version upgrade for existing software is simple.

  The present invention can be applied not only to the above-described COD measurement of rice samples, but also to the COD measurement of other types of cereals such as wheat that is washed with raw materials and processed into foods.

DESCRIPTION OF SYMBOLS 1 COD measuring device by optical method of rice sharpening juice 2 Test tube 3 Water supply device with heat retention function 4 Ultrasonic cleaning device with heat retention function 5 Strainer 6 Cell 7 Optical measurement means 8 COD arithmetic processing means 11 Water supply device 12 Heater 13 Test tube fixing basket 14 Ultrasonic cleaning device main body 21 Light source 22 Light receiving element 30 Control unit 31 ROM
32 Absorbance Data Generation Unit 33 COD Operation Unit 34 Display 35 Printer 36 Input Unit

Claims (4)

A sample storage means for quantitatively storing rice samples;
Water supply means for supplying water at a constant temperature within a range that does not raise the temperature at which the rice sample is gelatinized;
Suspension means for suspending the rice sample at a constant environmental temperature within a range that does not raise the temperature at which the rice sample is gelatinized;
A sharpening juice preparation means for trapping a rice sample suspended by the suspension means to obtain a sharpening juice of the rice sample;
Optical measuring means for measuring absorbance of the rice sample sharpening juice;
COD calculation processing means for obtaining a COD value of the sharpening juice of the rice sample based on a measurement signal from the optical measurement means, and outputting a calculation result;
An apparatus for measuring COD using an optical system for rice sharpening juice. A sample storage means for quantitatively storing rice samples;
Water supply means for supplying water at a constant temperature within a range of 35 to 54 ° C., which is easy to control temperature throughout the four seasons without raising the temperature at which the rice sample is gelatinized;
Suspension means for suspending the rice sample at a constant environmental temperature within a range of 35 to 54 ° C., which is easy to control the temperature throughout the season without increasing the temperature at which the rice sample becomes gelatinized;
A sharpening juice preparation means for trapping a rice sample suspended by the suspension means to obtain a sharpening juice of the rice sample;
Optical measuring means for measuring absorbance of the rice sample sharpening juice;
COD calculation processing means for obtaining a COD value of the sharpening juice of the rice sample based on a measurement signal from the optical measurement means, and outputting a calculation result;
An apparatus for measuring COD using an optical system for rice sharpening juice. A process of quantitatively storing rice samples in the sample storage means;
A process of supplying water at a constant temperature that is easy to control temperature throughout the four seasons within a range that does not raise the temperature at which the rice sample will gelatinize,
The process of suspending the rice sample under a certain environmental temperature where temperature control is easy throughout the four seasons within the range where the temperature at which the rice sample is gelatinized is not raised,
A process of obtaining a rice sample sharpened juice by squeezing a rice sample suspended by a suspension means with a strainer;
An optical measurement process for measuring the absorbance of the rice sample sharpened juice;
A COD calculation process for obtaining the COD value of the sharpening juice of the rice sample based on the measurement signal from the optical measurement means, and outputting the calculation result;
A method for measuring COD by the optical method of rice soup stock. A process of quantitatively storing rice samples in the sample storage means;
A process of supplying water at a constant temperature within a range of 35 to 54 ° C., which is easy to control temperature throughout the four seasons without raising the temperature at which the rice sample is gelatinized,
A process of suspending the rice sample at a constant environmental temperature within a range of 35 to 54 ° C., which is easy to control temperature throughout the four seasons without raising the temperature at which the rice sample becomes gelatinized.
A process of obtaining a rice sample sharpened juice by squeezing a rice sample suspended by a suspension means with a strainer;
An optical measurement process for measuring the absorbance of the rice sample sharpened juice;
A COD calculation process for obtaining the COD value of the sharpening juice of the rice sample based on the measurement signal from the optical measurement means, and outputting the calculation result;
A method for measuring COD by the optical method of rice soup stock.